def get_bv(mag, cbv, cbv2=None, cbv3=None):
idx = np.isfinite(mag)
if not np.sum(idx):
return 0
if cbv2 is not None and cbv3 is not None:
for iter in range(1):
C = least_squares(lstsq_fn, [np.median(mag[idx]), 0.5],
args=(mag[idx], cbv[idx], cbv2[idx], cbv3[idx]),
verbose=0)
mag1 = C.x[0] + cbv * C.x[1] + cbv2 * C.x[1]**2 + cbv3 * C.x[1]**3
idx = np.abs(mag - mag1) < 3.0 * mad_std((mag - mag1)[idx])
return C.x[1]
else:
X = np.vstack([np.ones_like(mag), cbv]).T
Y = mag
idx = np.ones_like(Y, dtype=np.bool)
for i in xrange(3):
C = np.linalg.lstsq(X[idx], Y[idx])[0]
YY = np.sum(X * C, axis=1)
idx = np.abs(Y - YY) < 3.0 * mad_std(Y - YY)
return -C[1]
def sigma_clip_centroid(self, sigma=3.5, plot=False):
"""
Sigma-clip the light curve on centroid position (update mask).
Parameters
----------
sigma : float
Factor of standard deviations away from the median centroid position
to clip on.
plot : bool
Plot the accepted centroids (in black) and the centroids of the
rejected fluxes (in red).
"""
x_mean = np.median(self.centroid_x)
y_mean = np.median(self.centroid_y)
x_std = mad_std(self.centroid_x)
y_std = mad_std(self.centroid_y)
outliers = (sigma * min([x_std, y_std]) <
np.hypot(self.centroid_x - x_mean,
self.centroid_y - y_mean))
if plot:
plt.scatter(self.centroid_x[~outliers], self.centroid_y[~outliers],
marker=',', color='k')
plt.scatter(self.centroid_x[outliers], self.centroid_y[outliers],
marker='.', color='r')
plt.xlabel('BJD')
plt.ylabel('Flux')
self.mask |= outliers
def _flag_pixels(self):
#setup masked array for inversion
mstack = np.nanmedian(self.normstack, axis=1)
dev = np.clip(mad_std(self.normstack, axis=1, ignore_nan=True), 1e-10,
None)
self.sigma_mask = (np.fabs(self.normstack - mstack[:, np.newaxis]) /
dev[:, np.newaxis] > 6.)
#iteratively clean pixels for reconstruction
for ii in range(5):
old_mask = np.copy(self.sigma_mask)
tarray = np.copy(self.normstack)
tarray[self.sigma_mask] = np.nan
mstack = np.nanmedian(tarray, axis=1)
dev = np.clip(mad_std(tarray, axis=1, ignore_nan=True), 1e-10,
None)
self.sigma_mask = (
np.fabs(self.normstack - mstack[:, np.newaxis]) /
dev[:, np.newaxis] > 6.)
if np.all(self.sigma_mask == old_mask):
break
logger.info('Flagged %d pixels to mask during reconstruction',
np.count_nonzero(self.sigma_mask))
def __call__(self, rho: Optional[float] = 2., niter: int = 5):
logger.info("Running Celerite Matern 3/2 detrending")
time = self.ts.time.copy()
flux = self.ts.flux.copy()
mask = ones(time.size, bool)
for i in range(niter):
time_learn = time[mask]
flux_learn = flux[mask]
wn = mad_std(diff(flux_learn)) / sqrt(2)
log_sigma = log(mad_std(flux_learn))
log_rho = log(rho)
kernel = Matern32Term(log_sigma, log_rho)
gp = GP(kernel, mean=1.0)
gp.compute(time_learn, yerr=wn)
self.prediction = gp.predict(flux_learn, time, return_cov=False)
mask &= ~sigma_clip(flux - self.prediction, sigma=3).mask
residuals = flux - self.prediction
self.mask = m = ~(sigma_clip(residuals, sigma_lower=inf,
sigma_upper=4).mask)
self.ts._data.update('celerite_m32', time[m],
(flux - self.prediction + 1)[m], self.ts.ferr[m])
def match_fits(fitsfile1, fitsfile2, header=None, sigma_cut=False,
use_mad_std=True,
return_header=False, **kwargs):
"""
Project one FITS file into another's coordinates
If sigma_cut is used, will try to find only regions that are significant
in both images using the standard deviation
Parameters
----------
fitsfile1: str
Reference fits file name
fitsfile2: str
Offset fits file name
header: pyfits.Header
Optional - can pass a header to projet both images to
sigma_cut: bool or int
Perform a sigma-cut on the returned images at this level
use_mad_std : bool
Use mad_std instead of std dev for stddev estimation
Returns
-------
image1,image2,[header] : Two images projected into the same space, and
optionally the header used to project them
"""
if header is None:
header = load_header(fitsfile1)
image1 = load_data(fitsfile1)
else: # project image 1 to input header coordinates
image1 = project_to_header(fitsfile1, header)
# project image 2 to image 1 coordinates
image2_projected = project_to_header(fitsfile2, header)
if image1.shape != image2_projected.shape:
raise ValueError("Failed to reproject images to same shape.")
if sigma_cut:
std1 = stats.mad_std(image1, ignore_nan=True) if use_mad_std else np.nanstd(image1)
std2 = stats.mad_std(image2_projected, ignore_nan=True) if use_mad_std else np.nanstd(image2_projected)
corr_image1 = image1*(image1 > (std1*sigma_cut))
corr_image2 = image2_projected*(image2_projected > (std2*sigma_cut))
OK = np.isfinite(corr_image1) & np.isfinite(corr_image2)
if (corr_image1[OK]*corr_image2[OK]).sum() == 0:
# This state seems to be reached in places when the condition above is False.
print("Could not use sigma_cut of %f because it excluded all valid data" % sigma_cut)
corr_image1 = image1
corr_image2 = image2_projected
else:
corr_image1 = image1
corr_image2 = image2_projected
returns = corr_image1, corr_image2
if return_header:
returns = returns + (header,)
return returns
def sigma_rob(data, iterations=1, thresh=3.0, axis=None):
"""
Iterative m.a.d. based sigma with positive outlier rejection.
"""
noise = mad_std(data, axis=axis)
for _ in range(iterations):
ind = (np.abs(data) <= thresh * noise).nonzero()
noise = mad_std(data[ind], axis=axis)
return noise
def match_fits(fitsfile1, fitsfile2, header=None, sigma_cut=False,
use_mad_std=True,
return_header=False, **kwargs):
"""
Project one FITS file into another's coordinates
If sigma_cut is used, will try to find only regions that are significant
in both images using the standard deviation
Parameters
----------
fitsfile1: str
Reference fits file name
fitsfile2: str
Offset fits file name
header: pyfits.Header
Optional - can pass a header to projet both images to
sigma_cut: bool or int
Perform a sigma-cut on the returned images at this level
use_mad_std : bool
Use mad_std instead of std dev for stddev estimation
Returns
-------
image1,image2,[header] : Two images projected into the same space, and
optionally the header used to project them
"""
if header is None:
header = load_header(fitsfile1)
image1 = load_data(fitsfile1)
else: # project image 1 to input header coordinates
image1 = project_to_header(fitsfile1, header)
# project image 2 to image 1 coordinates
image2_projected = project_to_header(fitsfile2, header)
if image1.shape != image2_projected.shape:
raise ValueError("Failed to reproject images to same shape.")
if sigma_cut:
std1 = stats.mad_std(image1, ignore_nan=True) if use_mad_std else np.nanstd(image1)
std2 = stats.mad_std(image2_projected, ignore_nan=True) if use_mad_std else np.nanstd(image2_projected)
corr_image1 = image1*(image1 > std1*sigma_cut)
corr_image2 = image2_projected*(image2_projected > std2*sigma_cut)
OK = np.isfinite(corr_image1) & np.isfinite(corr_image2)
if (corr_image1[OK]*corr_image2[OK]).sum() == 0:
print("Could not use sigma_cut of %f because it excluded all valid data" % sigma_cut)
corr_image1 = image1
corr_image2 = image2_projected
else:
corr_image1 = image1
corr_image2 = image2_projected
returns = corr_image1, corr_image2
if return_header:
returns = returns + (header,)
return returns
def plotresults(testlabels,infer,model_1,model_2):
std_avg=mad_std(infer-testlabels)
std_m1=mad_std(model_1-testlabels)
std_m2=mad_std(model_2-testlabels)
bias_av,rms_av=returnscatter(testlabels-infer)
bias_m1,rms_m1=returnscatter(testlabels-model_1)
bias_m2,rms_m2=returnscatter(testlabels-model_2)
plt.figure(figsize=(20,15))
plt.subplot(221)
x=np.linspace(1.5,4.8,100)
plt.plot(x,x,c='k',linestyle='dashed')
plt.scatter(testlabels,infer,facecolors='none',edgecolors='r',label='Average',zorder=10)
plt.scatter(testlabels,model_1,facecolors='none', edgecolors='g',label='Model-1')
plt.scatter(testlabels,model_2,facecolors='none', edgecolors='b',label='Model-2')
plt.xlabel('True')
plt.ylabel('Inferred')
plt.legend(loc=2)
plt.subplot(222)
x=np.linspace(1.5,4.8,100)
plt.plot(x,x,c='k',linestyle='dashed')
plt.scatter(testlabels,infer,facecolors='none',edgecolors='r',label='Average',zorder=10)
plt.text(1.5,4.5,s='m.std={}'.format(round(std_avg,3)))
plt.text(1.5,4.2,s='RMS={}'.format(round(rms_av,2)))
plt.text(1.5,3.9,s='Bias={}'.format(round(bias_av,3)))
plt.xlabel('True')
plt.ylabel('Inferred')
plt.legend(loc=1)
plt.subplot(223)
x=np.linspace(1.5,4.8,100)
plt.plot(x,x,c='k',linestyle='dashed')
plt.scatter(testlabels,model_1,facecolors='none', edgecolors='g',label='Model-1')
plt.text(1.5,4.5,s='m.std={}'.format(round(std_m1,3)))
plt.text(1.5,4.2,s='RMS={}'.format(round(rms_m1,2)))
plt.text(1.5,3.9,s='Bias={}'.format(round(bias_m1,3)))
plt.xlabel('True')
plt.ylabel('Inferred')
plt.legend(loc=1)
plt.subplot(224)
x=np.linspace(1.5,4.8,100)
plt.plot(x,x,c='k',linestyle='dashed')
plt.scatter(testlabels,model_2,facecolors='none', edgecolors='b',label='Model-2')
plt.text(1.5,4.5,s='m.std={}'.format(round(std_m2,3)))
plt.text(1.5,4.2,s='RMS={}'.format(round(rms_m2,2)))
plt.text(1.5,3.9,s='Bias={}'.format(round(bias_m2,3)))
plt.xlabel('True')
plt.ylabel('Inferred')
plt.legend(loc=1)
#plt.suptitle('Logg - 10 neighbours')
plt.savefig(savedir+'results.png')
# plt.show()
print('average',std_avg,rms_av,bias_av)
print('model_1',std_m1,rms_m1,bias_m1)
print('model_2',std_m2,rms_m2,bias_m2)
def sigma_rob(data, iterations=1, thresh=3.0, axis=None):
"""
Iterative m.a.d. based sigma with positive outlier rejection.
"""
noise = mad_std(data, axis=axis)
for _ in range(iterations):
ind = (np.abs(data) <= thresh * noise).nonzero()
noise = mad_std(data[ind], axis=axis)
return noise
def compute_empirical_bg_sigma(self, careful_sky=False):
if careful_sky:
if self.segmap is None:
self.set_segmap()
# this could go wrong in pathological case that
# segmap is nonzero for all pixels
return mad_std(self.image[self.segmap.array == 0])
else:
return mad_std(self.image)
def do_photometry(hdu, extensions=None, threshold=5, fwhm=2.5):
if extensions is None:
extensions = np.arange(1, len(hdu))
if not isiterable(extensions):
extensions = (extensions, )
output = {}
for ext in extensions:
header = hdu[ext].header
data = hdu[ext].data
image_wcs = WCS(header)
background = mad_std(data)
sources = daofind(data, threshold=threshold * background, fwhm=fwhm)
positions = (sources['xcentroid'], sources['ycentroid'])
sky_positions = pixel_to_skycoord(*positions, wcs=image_wcs)
apertures = CircularAperture(positions, r=2.)
photometry_table = aperture_photometry(data, apertures)
photometry_table['sky_center'] = sky_positions
output[str(ext)] = photometry_table
return output
def generate_aperture(fluxes, n=5):
flsum = np.nansum(fluxes, axis=0)
thr = mad_std(flsum)
thm = flsum > n*thr
pos = np.column_stack(np.where(thm))
db = DBSCAN(eps=rc, min_samples=nc).fit(pos)
#ncl = np.unique(db.labels_).size - (1 if -1 in db.labels_ else 0)
clpos = np.transpose(pos[db.labels_ != -1])
cluster = np.zeros(flsum.shape).astype(bool)
cluster[clpos[0], clpos[1]] = True
gauss = ndi.gaussian_filter(flsum, 0.5)
gauss[~cluster] = 0
nbh = np.ones((3,3))
localmax = (ndi.filters.maximum_filter(gauss, footprint=nbh) == gauss) & cluster
maxloc = np.column_stack(np.where(localmax))
markers = ndi.label(localmax)[0]
labels = watershed(-flsum, markers, mask=cluster)
'''
nstars = labels.max()
starmask = np.zeros((nstars, flsum.shape[0], flsum.shape[1])).astype(bool)
for i in range(nstars):
starmask[i][labels == i+1] = True
'''
return labels
def secEclipse(params):
per = params.tlsOut.period
tdur = params.tlsOut.duration
foldY = params.tlsOut.folded_y
foldX = params.tlsOut.folded_phase
depth = params.tlsOut.depth
fit_b = params.impact
seDepth = 1 - np.mean(foldY[(foldX < tdur / per / 2) |
(foldX > 1 - tdur / per / 2)])
seDepthsd = mad_std(foldY[(foldX < tdur / per / 2) |
(foldX > 1 - tdur / per / 2)])
if 0.1 * depth < seDepth:
if fit_b >= .9:
params.SE_found = True
params.secEclipseFP = True
else:
params.SE_found = True
params.secEclipseFP = False
elif seDepth > 3 * seDepthsd:
params.secEclipseFP = False
params.SE_found = True
else:
params.secEclipseFP = False
params.SE_found = False
return params
def fit(self, niter=5):
"""Determine the fit of the model to the data points with rejection
For each iteraction, a weight is calculated based on the distance a source
is from the relationship and outliers are rejected.
Parameters
----------
niter: int
Number of iteractions for the fit
"""
fitter = md.fitting.LinearLSQFitter()
weights = np.ones_like(self.x)
for i in range(niter):
self.model = fitter(self.model, self.x, self.wavelength, weights=weights)
#caculate the weights based on the median absolute deviation
r = (self.wavelength - self.model(self.x))
s = stats.mad_std(r)
biweight = lambda x: ((1.0 - x ** 2) ** 2.0) ** 0.5
if s!=0:
weights = 1.0/biweight(r / s)
else:
weights = np.ones(len(self.x))
def save_fitbg(star):
"""
Saves the results of the `fit_background` module.
Parameters
----------
star : target.Target
pipeline target with the results of the `fit_background` routine
"""
df = pd.DataFrame(star.fitbg['results'][star.name])
if star.fitbg['convert']:
df = convert_samples(df, drop=star.fitbg['drop'])
star.df = df.copy()
new_df = pd.DataFrame(columns=['parameter', 'value', 'uncertainty'])
for c, col in enumerate(df.columns.values.tolist()):
new_df.loc[c, 'parameter'] = col
new_df.loc[c, 'value'] = df.loc[0,col]
if star.fitbg['mc_iter'] > 1:
new_df.loc[c, 'uncertainty'] = mad_std(df[col].values)
else:
new_df.loc[c, 'uncertainty'] = '--'
new_df.to_csv('%sbackground.csv'%star.params[star.name]['path'], index=False)
if star.fitbg['samples']:
df.to_csv('%ssamples.csv'%star.params[star.name]['path'], index=False)
def photometry(self,filepath, b, d):
hdulist = fits.open(filepath, ignore_missing_end=True)
hdu = hdulist[0]
hdu.data.shape
image = hdu.data.astype(float)
image -= np.median(image)
bkg_sigma = mad_std(image)
daofind = DAOStarFinder(fwhm=b, threshold=d * bkg_sigma)
sources = daofind(image) # Save Stellar Sources from DOA Star Algorithm
for col in sources.colnames:
sources[col].info.format = '%.8g' # for consistent table output
print(sources)
# Perform Aperture Photometry
positions = (sources['xcentroid'], sources['ycentroid'])
apertures = CircularAperture(positions, r=17.)
phot_table = aperture_photometry(image, apertures)
for col in phot_table.colnames:
phot_table[col].info.format = '%.8g' # for consistent table output
filedest1 = input("Where to Save the result:")
filedest2 = input("Where to Save the result 2:")
print(phot_table)
np.savetxt(filedest1, (sources), delimiter=',') # Save Result in CSV
np.savetxt(filedest2, (phot_table), delimiter=',') # Save Result in CSV
plt.imshow(image, cmap='gray_r', origin='lower')
apertures.plot(color='blue', lw=1.5, alpha=0.5)
plt.show()
def gaussian_kernel_acf(t,x,x_err,delta_tau,n):
""" Compute the autocorrelation function for timeseries x(t) at lags
k*delta_tau for k in 0..n using a gaussian kernel."""
for i in range(5):
x = (x-np.median(x))/mad_std(x)
q = np.where(np.abs(x)<3.5)
x = x[q]
t = t[q]
nx = len(x)
x = (x-np.mean(x))/np.std(x)
Ti, Tj = np.meshgrid(t,t)
Tau = Tj - Ti
Xi, Xj = np.meshgrid(x,x)
Xj = np.tril(Xj,k=-1)
acf = np.zeros(n)
for k in range(n):
h = k*delta_tau
b = np.exp(-Tau**2/(2*h**2))/np.sqrt(2*np.pi*h)
b = np.tril(b,k=-1)
Xjb = Xj*b
acf[k] = np.sum([np.dot(x[m]*np.ones(nx),Xjb[:,m]) for m in range(nx)])/np.sum(b)
return acf
def ts(self, verbose=False, sigma_clip=4):
''' Reads in a timeseries from the file stored in data file ONLY.
All data modification is to be done in the frequency domain.
'''
data = np.genfromtxt(self.data_file)
#print data[0:5]
data[:,1] = data[np.argsort(data[:,0]),1] # re-order flux by time
data[:,0] = data[np.argsort(data[:,0]),0] # re-order time
self.time = (data[:,0] - data[0,0]) * 24.0 * 3600.0 # start time at 0 secs
self.flux = data[:,1]
self.flux = self.flux[np.argsort(self.time)]
self.time = self.time[np.argsort(self.time)]
# remove data gaps
self.time = self.time[(self.flux != 0) & (np.isfinite(self.flux))]
self.flux = self.flux[(self.flux != 0) & (np.isfinite(self.flux))]
self.flux = self.flux[np.argsort(self.time)]
self.time = self.time[np.argsort(self.time)]
self.flux_fix = self.flux
sel = np.where(np.abs(self.flux_fix) < mad_std(self.flux_fix) * sigma_clip)
self.flux_fix = self.flux_fix[sel] # remove extreme values
self.time_fix = self.time[sel] # remove extreme values
if verbose:
print("Read file {}".format(self.data_file))
print("Data points : {}".format(len(self.time)))
def get_bias(bias, gain=1):
'''Calculate superbias and readnoise.
Apply sigma-clipping to all given bias images.
Calculate readnoise (median robust standard deviation multiplied by gain)
Get superbias by averaging all bias images.
Parameters
----------
bias : 3D ndarray
Array of bias images.
gain : float, optional
Electrons per ADU in given bias images (default is 1).
Returns
-------
suber_bias : 2D ndarray
Superbias image.
read_noise : float
Read noise in the current observations
'''
bias_clean = astats.sigma_clip(bias, sigma=5)
read_noise = np.median(astats.mad_std(bias, axis=(1, 2))) * gain
superbias = np.average(bias_clean, axis=0)
superbias = superbias.filled(superbias.mean())
return (superbias, read_noise)
def running_MAD_2D(z, w, verbose=False, parallel=False):
"""Computers a running standard deviation of a 2-dimensional array z.
The stddev is evaluated over the vertical block with width w pixels.
The output is a 1D array with length equal to the width of z.
This is very slow on arrays that are wide in x (hundreds of thousands of points)."""
import astropy.stats as stats
import numpy as np
from tayph.vartests import typetest, dimtest, postest
import tayph.util as ut
if parallel: from joblib import Parallel, delayed
typetest(z, np.ndarray, 'z in fun.running_MAD_2D()')
dimtest(z, [0, 0], 'z in fun.running_MAD_2D()')
typetest(w, [int, float], 'w in fun.running_MAD_2D()')
postest(w, 'w in fun.running_MAD_2D()')
size = np.shape(z)
ny = size[0]
nx = size[1]
s = np.arange(0, nx, dtype=float) * 0.0
dx1 = int(0.5 * w)
dx2 = int(int(0.5 * w) + (w % 2)) #To deal with odd windows.
for i in range(nx):
minx = max([0, i - dx1]) #This here is only a 3% slowdown.
maxx = min([nx, i + dx2])
s[i] = stats.mad_std(
z[:, minx:maxx],
ignore_nan=True) #This is what takes 97% of the time.
if verbose: ut.statusbar(i, nx)
return (s)
def chunk_stats(list_data, chunk_size=15):
"""Cut the datasets in chunks and take the median
Return the set of medians
"""
ndatasets = len(list_data)
nchunk_x = np.int(list_data[0].shape[0] // chunk_size - 1)
nchunk_y = np.int(list_data[0].shape[1] // chunk_size - 1)
# Check that all datasets have the same size
med_data = np.zeros((ndatasets, nchunk_x * nchunk_y), dtype=np.float32)
std_data = np.zeros_like(med_data)
if not all([d.size for d in list_data]):
upipe.print_error(
"Datasets are not of the same size in median_compare")
else:
for i in range(0, nchunk_x):
for j in range(0, nchunk_y):
for k in range(ndatasets):
# Taking the median
med_data[k, i * nchunk_y + j] = np.median(
list_data[k][i * chunk_size:(i + 1) * chunk_size,
j * chunk_size:(j + 1) * chunk_size])
std_data[k, i * nchunk_y + j] = mad_std(
list_data[k][i * chunk_size:(i + 1) * chunk_size,
j * chunk_size:(j + 1) * chunk_size])
return med_data, std_data
def sigma_clip(array,nsigma=3.0,MAD=False):
"""This returns the n-sigma boundaries of an array, mainly used for scaling plots.
Parameters
----------
array : list, np.ndarray
The array from which the n-sigma boundaries are required.
nsigma : int, float
The number of sigma's away from the mean that need to be provided.
MAD : bool
Use the true standard deviation or MAD estimator of the standard deviation
(works better in the presence of outliers).
Returns
-------
vmin,vmax : float
The bottom and top n-sigma boundaries of the input array.
"""
from tayph.vartests import typetest
import numpy as np
typetest(array,[list,np.ndarray],'array in fun.sigma_clip()')
typetest(nsigma,[int,float],'nsigma in fun.sigma_clip()')
typetest(MAD,bool,'MAD in fun.sigma_clip()')
m = np.nanmedian(array)
if MAD:
from astropy.stats import mad_std
s = mad_std(array,ignore_nan=True)
else:
s = np.nanstd(array)
vmin = m-nsigma*s
vmax = m+nsigma*s
return vmin,vmax
def Periodogram(self, madVar=True):
""" This function computes the power spectrum from the timeseries ONLY.
"""
dtav = np.mean(np.diff(self.time_fix)) # mean value of time differences (s)
dtmed = np.median(np.diff(self.time_fix)) # median value of time differences (s)
if dtmed == 0: dtmed = dtav
# compute periodogram from regular frequency values
fmin = 0 # minimum frequency
N = len(self.time_fix) # n-points
df = 1./(dtmed*N) # bin width (1/Tobs) (in Hz)
model = LombScargleFast().fit(self.time_fix, self.flux_fix, np.ones(N))
power = model.score_frequency_grid(fmin, df, N/2) # signal-to-noise ratio, (1) eqn 9
freqs = fmin + df * np.arange(N/2) # the periodogram was computed over these freqs (Hz)
# the variance of the flux
if madVar: var = mad_std(self.flux_fix)**2
else: var = np.std(self.flux_fix)**2
# convert to PSD, see (1) eqn 1, 8, 9 & (2)
power /= np.sum(power) # make the power sum to unity (dimensionless)
power *= var # Parseval's theorem. time-series units: ppm. variance units: ppm^2
power /= df * 1e6 # convert from ppm^2 to ppm^2 muHz^-1
if len(freqs) < len(power): power = power[0:len(freqs)]
if len(freqs) > len(power): freqs = freqs[0:len(power)]
self.freq = freqs * 1e6 # muHz
self.power = power # ppm^2 muHz^-1
self.bin_width = df * 1e6 # muHz
def calculate_statistics_no_clipping(self):
"""
This function ...
:return:
"""
# Compress (remove masked values)
flattened = np.ma.array(self.sources_with_noise.data, mask=self.rotation_mask.data).compressed()
median = np.median(flattened)
biweight_loc = biweight_location(flattened)
biweight_midvar = biweight_midvariance(flattened)
median_absolute_deviation = mad_std(flattened)
#print("median", median)
#print("biweigth_loc", biweight_loc)
#print("biweight_midvar", biweight_midvar)
#print("median_absolute_deviation", median_absolute_deviation)
self.statistics.no_clipping = Map()
self.statistics.no_clipping.median = median
self.statistics.no_clipping.biweight_loc = biweight_loc
self.statistics.no_clipping.biweight_midvar = biweight_midvar
self.statistics.no_clipping.median_absolute_deviation = median_absolute_deviation
def simple_para_clean(pmaps, ncomp, npara=4):
# clean parameter maps based on their error values
pmaps = pmaps.copy()
# remove component with vlsrErr that is number of sigma off from the median as specified below
std_thres = 2
pmaps[pmaps == 0] = np.nan
# loop through each component
for i in range(0, ncomp):
# get the STD and Medians of the vlsr errors
std_vErr = mad_std(pmaps[(i + ncomp) * npara][np.isfinite(
pmaps[(i + ncomp) * npara])])
median_vErr = np.median(pmaps[(i + ncomp) * npara][np.isfinite(
pmaps[(i + ncomp) * npara])])
# remove outlier pixels
mask = pmaps[(i + ncomp) * npara] > median_vErr + std_vErr * std_thres
pmaps[i * npara:(i + 1) * npara, mask] = np.nan
pmaps[(i + ncomp) * npara:(i + ncomp + 1) * npara, mask] = np.nan
return pmaps
def fit_2d(x, y, z, x0, y0, weights=None, order=4, niter=3):
# Fit
sx = (x - np.mean(x))/np.max(x)
sy = (y - np.mean(y))/np.max(y)
X = make_series(1.0, sx, sy, order=order)
X = np.vstack(X).T
Y = z
idx = np.isfinite(Y)
for i in range(niter):
if weights is not None:
C = sm.WLS(Y[idx], X[idx], weights=weights[idx]).fit()
else:
C = sm.RLM(Y[idx], X[idx]).fit()
YY = np.sum(X*C.params, axis=1)
idx = np.abs(Y-YY - np.median((Y-YY)[idx])) < 3.0*mad_std((Y-YY)[idx])
# Predict
sx = (x0 - np.mean(x))/np.max(x)
sy = (y0 - np.mean(y))/np.max(y)
X = make_series(1.0, sx, sy, order=order)
X = np.vstack(X).T
return np.sum(X*C.params, axis=1)
def CalcBkg(self): if not isinstance(self.img, np.ndarray): return from astropy.stats import mad_std bkg = np.median(self.img) sigma = mad_std(self.img) self.bkg = bkg self.bkg_sigma = sigma
def findStars(image):
# In order to use the MAD as a consistent estimator for the estimation
# of the standard deviation σ, one takes σ = k * MAD where k is a constant
# scale factor, which depends on the distribution. For normally distributed
# data k is taken to be k = 1.48[26]
bkg_sigma = 1.48 * mad(image)
t = 5 * bkg_sigma
daofind = DAOStarFinder(fwhm=3.0, threshold=t)
stars = daofind(image)
#stars['signal'] = stars['flux'] * t
#
data = image
mask = make_source_mask(data, snr=2, npixels=5, dilate_size=11)
mean, median, std = sigma_clipped_stats(data, sigma=3.0, mask=mask)
madstd = mad_std(data)
snrs = []
for peak in stars['peak']:
snrs.append(peak / madstd / 7.4)
stars['snr'] = snrs
print((mean, median, std, bkg_sigma, t, madstd))
#
#print stars
return stars
def calculate_statistics_no_clipping(self):
"""
This function ...
:return:
"""
# Compress (remove masked values)
flattened = np.ma.array(self.sources_with_noise.data,
mask=self.rotation_mask.data).compressed()
median = np.median(flattened)
biweight_loc = biweight_location(flattened)
biweight_midvar = biweight_midvariance(flattened)
median_absolute_deviation = mad_std(flattened)
#print("median", median)
#print("biweigth_loc", biweight_loc)
#print("biweight_midvar", biweight_midvar)
#print("median_absolute_deviation", median_absolute_deviation)
self.statistics.no_clipping = Map()
self.statistics.no_clipping.median = median
self.statistics.no_clipping.biweight_loc = biweight_loc
self.statistics.no_clipping.biweight_midvar = biweight_midvar
self.statistics.no_clipping.median_absolute_deviation = median_absolute_deviation
def median_fwhm(self, direction):
"""Returns the sigma-clipped median fitted FWHM over both X
and Y in pixels over all stars that fitted successfully,
along with median absolute deviation (MAD) standard deviation.
Note that the deviation return is standard deviation based on
the MAD, not the MAD itself. See astropy.stats.mad_std
Direction must be one of 'both', 'x', or 'y'
"""
# Clip values that are more than this number of sigma from the
# median.
numsig = 3.0
# Select only cases where the fitting appeared to work correctly.
ok_x = self._fit_table['fwhm_x'][self._fit_table['fit_ok']]
ok_y = self._fit_table['fwhm_y'][self._fit_table['fit_ok']]
if 'both' in direction:
ok_fwhm = np.concatenate((ok_x, ok_y)) # Note inputs as tuple
elif 'x' in direction:
ok_fwhm = ok_x
elif 'y' in direction:
ok_fwhm = ok_y
clipped = sigma_clip(ok_fwhm, sigma=numsig, masked=False)
num_used = len(clipped)
self._logger.debug(
f'Estimating median FWHM (direction={direction}) using {num_used} FWHM measurements ({len(ok_fwhm)} OK fits before clipping).'
)
median_fwhm = float(np.median(clipped))
madstd_fwhm = float(mad_std(clipped))
return (median_fwhm, madstd_fwhm, num_used)
def fit(self, niter=5):
"""Determine the fit of the model to the data points with rejection
For each iteraction, a weight is calculated based on the distance a source
is from the relationship and outliers are rejected.
Parameters
----------
niter: int
Number of iteractions for the fit
"""
fitter = md.fitting.LinearLSQFitter()
weights = np.ones_like(self.x)
for i in range(niter):
self.model = fitter(self.model,
self.x,
self.wavelength,
weights=weights)
#caculate the weights based on the median absolute deviation
r = (self.wavelength - self.model(self.x))
s = stats.mad_std(r)
biweight = lambda x: ((1.0 - x**2)**2.0)**0.5
if s != 0:
weights = 1.0 / biweight(r / s)
else:
weights = np.ones(len(self.x))
def _remove_bad_pixels(col_index, dtype):
global original, original_shape, scaled, scaled_shape, output, output_shape, lambdas, img_center, psfs, psfs_shape, Npixproc, Npixtot
original_np = _arraytonumpy(original, original_shape, dtype=dtype)
tmpcube = copy(original_np[:, :, col_index])
nan_mask_boxsize = 3
x = np.arange(nl)
for m in np.arange(0, ny):
myvec = tmpcube[:, m]
wherefinite = np.where(np.isfinite(myvec))
if np.size(wherefinite[0]) < 10:
continue
smooth_vec = median_filter(myvec,
footprint=np.ones(100),
mode="constant",
cval=0.0)
myvec = myvec - smooth_vec
wherefinite = np.where(np.isfinite(myvec))
mad = mad_std(myvec[wherefinite])
original_np[np.where(np.abs(myvec) > 7 * mad)[0], m,
col_index] = np.nan
widen_nans = np.where(
np.isnan(
np.correlate(original_np[:, m, col_index],
np.ones(nan_mask_boxsize),
mode="same")))[0]
original_np[widen_nans, m, col_index] = np.nan
def compute_stats(x): """ Compute stats """ ## Compute stats npixels= np.size(x) pixel_min= np.min(x) pixel_max= np.max(x) mean= np.mean(x) stddev= np.std(x,ddof=1) median= np.median(x) mad= mad_std(x) skewness= stats.skew(x) kurtosis= stats.kurtosis(x) ## Compute robust stats niter= 1 sigmaclip= 3 [mean_clipped, median_clipped, stddev_clipped] = sigma_clipped_stats(x, sigma=sigmaclip, iters=niter, std_ddof=1) print '*** IMG STATS ***' print 'n=',npixels print 'min/max=',pixel_min,'/',pixel_max print 'mean=',mean print 'stddev=',stddev print 'median=',median print 'mad=',mad print 'skew=',skewness print 'kurtosis=',kurtosis print 'mean_clipped=',mean_clipped print 'median_clipped=',median_clipped print 'stddev_clipped=',stddev_clipped print '*****************'
def init_parameters(self):
name = self.name
wns = log10(mad_std(diff(self.fluxes)) / sqrt(2))
pgp = [
LParameter(f'{name}_ln_out',
f'{name} ln output scale',
'',
NP(-6, 1.5),
bounds=(-inf, inf)),
LParameter(f'{name}_ln_in',
f'{name} ln input scale',
'',
UP(-8, 8),
bounds=(-inf, inf)),
LParameter(f'{name}_log10_wn',
f'{name} log10 white noise sigma',
'',
NP(wns, 0.025),
bounds=(-inf, inf))
]
self.lpf.ps.thaw()
self.lpf.ps.add_global_block(self.name, pgp)
self.lpf.ps.freeze()
self.pv_slice = self.lpf.ps.blocks[-1].slice
self.pv_start = self.lpf.ps.blocks[-1].start
setattr(self.lpf, f"_sl_{name}", self.pv_slice)
setattr(self.lpf, f"_start_{name}", self.pv_start)
def fit_flux(self, **kwargs):
""" """
from .fitter import DiffImgFitter
from astropy.stats import mad_std
# Load the fitter
self.fitter = DiffImgFitter(self.diffimg, self.psfimg, 0, shape=self.psfshape)
# Load the fitter
robust_nmad = mad_std(self.fitter.data[~np.isnan(self.fitter.data)])
fit_prop = {
"ampl_guess": np.nanmax(self.fitter.data)
* (np.sqrt(2 * np.pi * 2 ** 2)), # 2 sigma guess
"sigma_guess": robust_nmad,
}
fit_prop["ampl_boundaires"] = [
-2 * np.nanmin(self.fitter.data) * (np.sqrt(2 * np.pi * 2 ** 2)),
5 * np.nanmax(self.fitter.data) * (np.sqrt(2 * np.pi * 2 ** 2)),
]
fit_prop["sigma_boundaries"] = [
robust_nmad / 10.0,
np.nanstd(self.fitter.data) * 2,
]
# Return fitter output
return self.fitter.fit(**{**fit_prop,**kwargs})
def _stats_data(self, stats, mask, scipy, astropy, decimals_mode):
data = self.data
# The original data size, for computation of valid elements and how
# many are masked/invalid.
size_initial = data.size
# Delete masked values, this will directly convert it to a 1D array
# if the mask is not appropriate then ravel it.
data = data[~mask]
size_masked = data.size
# Delete invalid (NaN, Inf) values. This should ensure that the result
# is always a 1D array
data = data[np.isfinite(data)]
size_valid = data.size
stats['elements'] = [size_valid]
stats['min'] = [np.amin(data)]
stats['max'] = [np.amax(data)]
stats['mean'] = [np.mean(data)]
stats['median'] = [np.median(data)]
# Use custom mode defined in this package because scipy.stats.mode is
# very, very slow and by default tries to calculate the mode along
# axis=0 and not for the whole array.
# Take the first element since the second is the number of occurences.
stats['mode'] = [mode(data, decimals=decimals_mode)[0]]
if astropy:
stats['biweight_location'] = [biweight_location(data)]
stats['std'] = [np.std(data)]
if astropy:
stats['mad'] = [mad_std(data)]
stats['biweight_midvariance'] = [biweight_midvariance(data)]
stats['var'] = [np.var(data)]
if scipy: # pragma: no cover
if not OPT_DEPS['SCIPY']:
log.info('SciPy is not installed.')
else:
# Passing axis=None should not be important since we already
# boolean indexed the array and it's 1D. But it's important
# to remember that there default is axis=0 and not axis=None!
stats['skew'] = [skew(data, axis=None)]
stats['kurtosis'] = [kurtosis(data, axis=None)]
stats['masked'] = [size_initial - size_masked]
stats['invalid'] = [size_masked - size_valid]
return data
def find_sources(imageFile, data, seeing_in_pix, threshold=5.):
# estimate the 1-sigma noise level using the median absolute deviation of the image
print "[*] Estimating 1-sigma noise level."
# generate a mask for 0 pixel counts. These are chip gaps or skycell edges generated by
# np.nan_to_num and will affect noise level estimate.
mask = np.where(data != 0)
bkg_sigma = mad_std(data[mask])
#print np.median(data), mad(data), bkg_sigma
# use daofind to detect sources setting
print "[*] Detecting %d-sigma sources in %s" % (threshold, imageFile)
sources = daofind(data, fwhm=seeing_in_pix, threshold=threshold*bkg_sigma)
print "[*] Source detection successful."
print "\t[i] %d sources detected: " % (len(sources["xcentroid"]))
print
print sources
return sources, bkg_sigma
def mad_std(self):
"""
A robust standard deviation using the `median absolute deviation
(MAD)
<http://en.wikipedia.org/wiki/Median_absolute_deviation>`_.
The MAD is defined as ``median(abs(a - median(a)))``.
The standard deviation estimator is given by:
.. math::
\\sigma \\approx \\frac{\\textrm{MAD}}{\Phi^{-1}(3/4)} \\approx 1.4826 \ \\textrm{MAD}
where :math:`\Phi^{-1}(P)` is the normal inverse cumulative
distribution function evaluated at probability :math:`P = 3/4`.
"""
return mad_std(self.goodvals)
def photometry(data, mywcs, regs, beam):
results = {}
for ii,reg in enumerate(regs):
if 'text' not in reg.meta:
name = str(ii)
else:
name = reg.meta['text'].strip("{}")
# all regions are points: convert them to 0.5" circles
phot_reg = regions.CircleSkyRegion(center=reg.center, radius=0.5*u.arcsec)
pixreg = phot_reg.to_pixel(mywcs)
bgreg = regions.CircleSkyRegion(center=reg.center, radius=1.5*u.arcsec).to_pixel(mywcs)
log.info(name)
mask = pixreg.to_mask()
cutout = mask.cutout(data) * mask.data
# how do I make an annulus?
bgmask = bgreg.to_mask()
# manualannulus
diff = bgmask.shape[0]-mask.shape[0]
bgm = bgmask.data.astype('bool')
bgm[int(diff/2):-int(diff/2), int(diff/2):-int(diff/2)] ^= mask.data.astype('bool')
assert bgm.sum() == bgmask.data.sum() - mask.data.sum()
bgcutout = bgmask.cutout(data) * bgm
results[name] = {'peak': cutout.max(),
'sum': cutout.sum(),
'bgrms': bgcutout.std(),
'bgmad': mad_std(bgcutout),
'npix': mask.data.sum(),
'beam_area': beam.sr,
'RA': reg.center.ra[0],
'Dec': reg.center.dec[0],
}
return results
def find_sources(image):
"""Return sources (x, y) sorted by brightness.
"""
from scipy import ndimage
from astropy.stats import mad_std
img1 = image.copy().astype('float32')
m, s = np.median(image), mad_std(image)
src_mask = image > m + 3.0 * s
# set the background to the min value of the sources
img1[~src_mask] = img1[src_mask].min()
# this rescales (min,max) to (0,1)
img1 = (img1.min() - img1) / (img1.min() - img1.max())
img1[~src_mask] = 0.
def obj_params_with_offset(img, labels, aslice, label_idx):
y_offset = aslice[0].start
x_offset = aslice[1].start
thumb = img[aslice]
lb = labels[aslice]
yc, xc = ndimage.center_of_mass(thumb, labels=lb, index=label_idx)
br = thumb[lb == label_idx].sum() # the intensity of the source
return [br, xc + x_offset, yc + y_offset]
srcs_labels, num_srcs = ndimage.label(img1)
if num_srcs < 10:
print("WARNING: Only %d sources found." % (num_srcs))
# Eliminate here all 1 pixel sources
all_objects = [[ind + 1, aslice] for ind, aslice
in enumerate(ndimage.find_objects(srcs_labels))
if srcs_labels[aslice].shape != (1, 1)]
lum = np.array([obj_params_with_offset(img1, srcs_labels, aslice, lab_idx)
for lab_idx, aslice in all_objects])
lum = lum[lum[:, 0].argsort()[::-1]] # sort by brightness descending order
return lum[:, 1:]
def PCA_light_curve(pr, transit_parameters, buffer_time=5*u.min,
outlier_mad_std_factor=3.0, plots=False,
validation_duration_fraction=1/6,
flux_threshold=0.89, validation_time=-0.65,
plot_validation=False, outlier_rejection=True):
"""
Parameters
----------
pr : `~toolkit.PhotometryResults`
transit_parameters : `~batman.TransitParams`
buffer_time : `~astropy.units.Quantity`
outlier_mad_std_factor : float
plots : bool
validation_duration_fraction : float
Returns
-------
best_lc : `~numpy.ndarray`
"""
expected_mid_transit_jd = ((np.max(np.abs(pr.times - transit_parameters.t0) //
transit_parameters.per) ) * # need to add +1 here for 20170502, don't know why TMP
transit_parameters.per + transit_parameters.t0)
mid_transit_time = Time(expected_mid_transit_jd, format='jd')
transit_duration = transit_parameters.duration + buffer_time
final_lc_mad = np.ones(len(pr.aperture_radii))
final_lc = None
figures = []
for aperture_index in range(len(pr.aperture_radii)):
target_fluxes = pr.fluxes[:, 0, aperture_index]
target_errors = pr.errors[:, 0, aperture_index]
if not outlier_rejection:
inliers = np.ones_like(pr.fluxes[:, 0, aperture_index]).astype(bool)
else:
inliers = np.ones_like(pr.fluxes[:, 0, aperture_index]).astype(bool)
for i in range(pr.fluxes.shape[1]):
flux_i = pr.fluxes[:, i, aperture_index]
linear_flux_trend = np.polyval(np.polyfit(pr.times - pr.times.mean(),
flux_i, 1),
pr.times - pr.times.mean())
new_inliers = (np.abs(flux_i - linear_flux_trend) < outlier_mad_std_factor *
mad_std(flux_i))
inliers &= new_inliers
out_of_transit = ((Time(pr.times, format='jd') > mid_transit_time + transit_duration/2) |
(Time(pr.times, format='jd') < mid_transit_time - transit_duration/2))
validation_duration = validation_duration_fraction * transit_duration
validation_mask = ((Time(pr.times, format='jd') < mid_transit_time +
validation_time * transit_duration + validation_duration / 2) &
(Time(pr.times, format='jd') > mid_transit_time +
validation_time * transit_duration - validation_duration / 2))
oot = out_of_transit & inliers
oot_no_validation = (out_of_transit & inliers & np.logical_not(validation_mask))
if plot_validation:
plt.figure()
plt.plot(pr.times[~oot], target_fluxes[~oot], '.', label='in-t')
plt.plot(pr.times[oot], target_fluxes[oot], '.', label='oot')
plt.plot(pr.times[validation_mask], target_fluxes[validation_mask], '.',
label='validation')
plt.axvline(mid_transit_time.jd, ls='--', color='r', label='midtrans')
plt.legend()
plt.title(np.count_nonzero(validation_mask))
plt.xlabel('JD')
plt.ylabel('Flux')
plt.show()
ones = np.ones((len(pr.times), 1))
regressors = np.hstack([pr.fluxes[:, 1:, aperture_index],
pr.xcentroids[:, 0, np.newaxis],
pr.ycentroids[:, 0, np.newaxis],
pr.airmass[:, np.newaxis],
pr.airpressure[:, np.newaxis],
pr.humidity[:, np.newaxis],
pr.background_median[:, np.newaxis]
])
n_components = np.arange(2, regressors.shape[1])
def train_pca_linreg_model(out_of_transit_mask, oot_no_validation_mask, n_comp):
# OOT chunk first:
pca = PCA(n_components=n_comp)
reduced_regressors = pca.fit_transform(regressors[out_of_transit_mask],
target_fluxes[out_of_transit_mask])
prepended_regressors_oot = np.hstack([ones[out_of_transit_mask],
reduced_regressors])
c_oot = regression_coeffs(prepended_regressors_oot,
target_fluxes[out_of_transit_mask],
target_errors[out_of_transit_mask])
lc_training = (target_fluxes[out_of_transit_mask] -
regression_model(c_oot, prepended_regressors_oot))
median_oot = np.median(target_fluxes[out_of_transit_mask])
std_lc_training = np.std((lc_training + median_oot) / median_oot)
# Now on validation chunk:
reduced_regressors_no_validation = pca.fit_transform(regressors[oot_no_validation_mask],
target_fluxes[oot_no_validation_mask])
prepended_regressors_no_validation = np.hstack([ones[oot_no_validation_mask],
reduced_regressors_no_validation])
c_no_validation = regression_coeffs(prepended_regressors_no_validation,
target_fluxes[oot_no_validation_mask],
target_errors[oot_no_validation_mask])
lc_validation = (target_fluxes[out_of_transit_mask] -
regression_model(c_no_validation, prepended_regressors_oot))
std_lc_validation = np.std((lc_validation + median_oot) / median_oot)
return lc_training, lc_validation, std_lc_training, std_lc_validation
stds_validation = np.zeros_like(n_components, dtype=float)
stds_training = np.zeros_like(n_components, dtype=float)
for i, n_comp in enumerate(n_components):
results = train_pca_linreg_model(oot, oot_no_validation, n_comp)
lc_training, lc_validation, std_lc_training, std_lc_validation = results
stds_validation[i] = std_lc_validation
stds_training[i] = std_lc_training
best_n_components = n_components[np.argmin(stds_validation)]
if plots:
fig = plt.figure()
plt.plot(n_components, stds_validation, label='validation')
plt.plot(n_components, stds_training, label='training')
plt.xlabel('Components')
plt.ylabel('std')
plt.axvline(best_n_components, color='r', ls='--')
plt.title("Aperture: {0} (index: {1})"
.format(pr.aperture_radii[aperture_index],
aperture_index))
plt.legend()
figures.append(fig)
# Now apply PCA to generate light curve with best number of components
pca = PCA(n_components=best_n_components)
reduced_regressors = pca.fit_transform(regressors[oot], target_fluxes[oot])
all_regressors = pca.transform(regressors)
prepended_all_regressors = np.hstack([ones, all_regressors])
prepended_regressors_oot = np.hstack([ones[oot], reduced_regressors])
c_oot = regression_coeffs(prepended_regressors_oot,
target_fluxes[oot],
target_errors[oot])
best_lc = ((target_fluxes - regression_model(c_oot, prepended_all_regressors)) /
np.median(target_fluxes)) + 1
final_lc_mad[aperture_index] = mad_std(best_lc[out_of_transit])
if final_lc_mad[aperture_index] == np.min(final_lc_mad):
final_lc = best_lc.copy()
if plots:
# Close all validation plots except the best aperture's
for i, fig in enumerate(figures):
if i != np.argmin(final_lc_mad):
plt.close(fig)
plt.figure()
plt.plot(pr.aperture_radii, final_lc_mad)
plt.axvline(pr.aperture_radii[np.argmin(final_lc_mad)], ls='--', color='r')
plt.xlabel('Aperture radii')
plt.ylabel('mad(out-of-transit light curve)')
plt.figure()
plt.plot(pr.times, final_lc, 'k.')
plt.xlabel('Time [JD]')
plt.ylabel('Flux')
plt.show()
return final_lc
def check_matches(files, cols,
neighbor,
upperlimits=[4, 10.0],
printlist=False,
debug=False,
**keyword_parameter):
"""
*preforms self-neighbour matching of file and returns diagnostic plots.
Parameters
----------
files: <type 'str'>
Name of file
columns : <type 'ndarray'> or <type 'list'>
array of column names needed. Must be
<type 'str'>.
neighbor: <type 'int'>
which nth-neighbor match needed.
Returns
-------
matplotlib image
Examples
--------
f1 = "output_DR12_1p44UKIDSSlas_4p0WISE_starL_GMM5QSOs.fits"
final_array = check_matches(f1,['ra','dec','psfMag_i'],2)
final_array = check_matches(f1,['ra','dec','psfMag_i'],2, save = '/Desktop/important_plot.png')
"""
from astropy.table import Table
figsize=(8,6)
median_and_mean = [[],[]]
print('files:', files)
match_object = files
columns_object = cols
# read in the data file
data = Table.read(files)
data.info('stats')
#to_match_RA = fitsio.read(match_object, columns=columns_object[0])
#to_match_DEC = fitsio.read(match_object, columns=columns_object[1])
#psfmag=fitsio.read(match_object, columns=columns_object[2])
#to_match_RA = Table.read(match_object, columns=columns_object[0])
#to_match_DEC = Table.read(match_object, columns=columns_object[1])
#psfmag= Table.read(match_object, columns=columns_object[2])
# help(data)
# help(to_match_RA)
print(columns_object[0])
to_match_RA = data[columns_object[0]]
to_match_DEC = data[columns_object[1]]
psfmag = data[columns_object[3]]
# help(to_match_RA)
print(to_match_RA.unit)
print(to_match_RA.shape)
print(len(to_match_RA), np.min(to_match_RA), np.max(to_match_RA))
vot = True
# check units and convert u.deg id needed
if to_match_RA.unit != 'deg':
to_match_RA = to_match_RA * u.deg
if to_match_DEC.unit != 'deg':
to_match_DEC = to_match_DEC * u.deg
skycoord_object = SkyCoord(to_match_RA, to_match_DEC,
frame='icrs')
# matches to self
idx, d2d, d3d = match_coordinates_sky(skycoord_object, skycoord_object,
nthneighbor=neighbor)
idx2 = np.asarray([i for i in range(len(idx))])
#set limits
separations = np.asarray(d2d)*3600.0
itest = (separations < upperlimits[0])
result = data[itest]
result_separations = separations[itest]
print(upperlimits[0])
print(result_separations)
if printlist:
for irow, row in enumerate(result):
print(irow,
row['ra'],
row['dec'],
row['dist'] * 3600.0,
result_separations[irow],
row['phot_g_mean_mag'])
upperlimit = upperlimits[0]
upperlimit2 = upperlimits[1]
separations_reduced = separations[(separations<=upperlimit)]
separations_orig = separations[(separations<=upperlimit2)]
psfmag_reduced=np.asarray(psfmag)[(separations<=upperlimit)]
# separations_reduced = separations[(np.asarray(psfmag)<18.0)*(separations<=upperlimit2)]
# separations_orig = separations[(separations<=upperlimit2)]
# psfmag_reduced=np.asarray(psfmag)[(np.asarray(psfmag)<18.0)]
masked_list_ra = np.asarray(skycoord_object.ra)[(idx)]
masked_list_dec = np.asarray(skycoord_object.dec)[(idx)]
masked_list_ra_cat = np.asarray(skycoord_object.ra)
masked_list_dec_cat = np.asarray(skycoord_object.dec)
# masked = skycoord_object[idx]
# dra, ddec = skycoord_object.spherical_offsets_to(masked)
# sky = SkyCoord(masked_list_ra*u.degree, masked_list_dec*u.degree, frame='icrs')
# dra, ddec = skycoord_object.spherical_offsets_to(sky)
# dra=float(dra.to(u.arcsec))
# ddec=float(dra.to(u.arcsec))
difference_ra = ((((masked_list_ra_cat-masked_list_ra)*np.cos(np.radians(masked_list_dec_cat))))*3600.0)
difference_dec = (((masked_list_dec_cat-masked_list_dec))*3600.0)
#final array
idx_pairs = idx[(separations<=upperlimits[0])]
idx_pairs_second = idx2[(separations<=upperlimits[0])]
masked_list_ra_pairs1 = np.asarray(skycoord_object.ra)[(idx_pairs)]
masked_list_dec_pairs1 = np.asarray(skycoord_object.dec)[(idx_pairs)]
masked_list_ra_pairs2 = np.asarray(skycoord_object.ra)[(idx_pairs_second)]
masked_list_dec_pairs2 = np.asarray(skycoord_object.dec)[(idx_pairs_second)]
median_and_mean = [list(difference_ra),list(difference_dec)]
median_and_mean = np.asarray(median_and_mean)
mad_standard = mad_std(median_and_mean)
mad_median = mad_med(median_and_mean)
length = len(masked_list_ra)
length30 = len(separations_reduced)
med = np.median(separations)
med_red = np.median(separations_reduced)
fig = plt.figure(1, figsize=(8,6))
print('files:', files, len(files))
print("file: %s" % files)
plt.suptitle("file: %s"% files, size=10)
#pylab.title("file: %s"% files,size=14, fontsize='medium')
ax1=fig.add_subplot(2,2,1)
print(len(separations_orig))
print(upperlimit2)
n, b, patches = ax1.hist(separations_orig,
bins=int(upperlimit2/0.5),
range=[0.0, upperlimit2],
color='green', alpha=0.3)
bin_min = np.where(n == n.min())
n1, b1, pathes1 = ax1.hist(separations_reduced,
bins=int(upperlimit2/0.5),
range=[0.0, upperlimit2],
color='blue')
ax1.set_xlim(0.0, upperlimit2)
ax1.locator_params(axis='x',nbins=4)
s0 = 'Matched to self'
ax1.annotate(s0,(0.28,0.95) , xycoords = 'axes fraction',size=8)
s04 = '# of Objects = %i'%length
ax1.annotate(s04,(0.28,0.90) , xycoords = 'axes fraction',size=8)
s01 = '(All objects) Median = %.2f' % med
ax1.annotate(s01,(0.28,0.85) , xycoords = 'axes fraction',size=8)
s03 = '# of objects <= %i arcsecs = %i' % (upperlimit, length30)
ax1.annotate(s03,(0.28,0.80) , xycoords = 'axes fraction',size=8)
s02 = '(Objects<=30arcsecs) Median = %.2f' % med_red
ax1.annotate(s02,(0.28,0.75) , xycoords = 'axes fraction',size=8)
ax1.set_xlabel('Separation (arcseconds)')
ax1.set_ylabel('Frequency')
ax2 = fig.add_subplot(2,2,2)
markersize = 0.5
markersize = 1.0
alpha = 1.0
ax2.plot(difference_ra, difference_dec,
'oc',
markersize=markersize, markeredgewidth=0.0,
alpha=alpha)
xrange = [-1.0*upperlimits[1], 1.0*upperlimits[1]]
yrange = [-1.0*upperlimits[1], 1.0*upperlimits[1]]
print(xrange + yrange)
ranges = xrange + yrange
# ax2.axis('equal')
ax2.set_aspect('equal')
ax2.axis(ranges)
ax2.locator_params(axis='x',nbins=4)
ax2.set_xlabel('Delta RA (")')
ax2.set_ylabel('Delta Dec (")')
# s11 = 'Zoomed-in to 30 arcsecs'
# ax2.annotate(s11,(0.45,0.95) , xycoords = 'axes fraction',size=8)
s1 = '# of Objects = %i' % length
ax2.annotate(s1,(0.45,0.90) , xycoords = 'axes fraction',size=8)
s7 = 'MAD = %.2f' % mad_median
ax2.annotate(s7,(0.45,0.85) , xycoords = 'axes fraction',size=8)
s3 = 'MAD_std = %.2f' % mad_standard
ax2.annotate(s3,(0.45,0.80) , xycoords = 'axes fraction',size=8)
ax3 = fig.add_subplot(2,2,3)
bin_size1=0.25; min_edge1=5;max_edge1=22
N1 = (max_edge1-min_edge1)/bin_size1; Nplus11 = N1 + 1
bin_list1 = np.linspace(min_edge1, max_edge1, Nplus11)
ax3.hist(psfmag_reduced,bins=bin_list1,color='blue')
xlabel = cols[2]
ax3.set_xlabel(xlabel)
ax3.set_ylabel('Frequency')
ax3.locator_params(axis='x',nbins=4)
# ax3.plot(to_match_RA,to_match_DEC,'og',markersize=0.5,markeredgewidth=0.0,alpha=0.3)
# ax3.locator_params(axis='x',nbins=4)
# ax3.set_xlabel('RA')
# ax3.set_ylabel('DEC')
ax4 = fig.add_subplot(2,2,4)
bin_size=0.25; min_edge=5;max_edge=22
N = (max_edge-min_edge)/bin_size; Nplus1 = N + 1
bin_list = np.linspace(min_edge, max_edge, Nplus1)
ax4.hist(psfmag_reduced,bins=bin_list,color='blue')
ax4.hist(psfmag,bins=bin_list,color='green',alpha=0.3)
xlabel = cols[2]
ax4.set_xlabel(xlabel)
ax4.set_ylabel('Frequency')
ax4.locator_params(axis='x',nbins=4)
fig.tight_layout()
fig.subplots_adjust(top=0.88)
plotid()
if ('save' in keyword_parameter):
path_to_save = str(keyword_parameter['save'])
plt.savefig(path_to_save,dpi=150)
else:
plt.show()
return (masked_list_ra_pairs1,masked_list_dec_pairs1,masked_list_ra_pairs2,masked_list_dec_pairs2)
def calc_background_rms(self, data, axis=None):
if self.sigma_clip is not None:
data = self.sigma_clip(data, axis=axis)
return mad_std(data, axis=axis)
def xmatch_checkplot(ra1, dec1, ra2, dec2,
figsize = (6.0, 6.0),
width=10.0,
gtype="all", add_plotid=True, prefix=None,
saveplot=True,
plotfile="", plotfile_prefix=None,
title="",
suptitle=""):
""" Makes checkplot for catalogue xmatch results
Forked from Sophie Reed's version on 20160319
uses hist2d; a point based option would be useful
Plot can either be square, the square inscribes the circle.
Or all which has all the points in the matching circle.
Square make the histograms more comparable.
Compares RA_main and DEC_main columns with RA and Dec columns in the
format output by the matching codes. Eg. RA_ + survey.
Width needs to be in arcsecs
"""
import math
import time
import inspect
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
from matplotlib.colors import LogNorm
# import stats
# import plotid
now = time.localtime(time.time())
datestamp = time.strftime("%Y%m%d", now)
function_name = inspect.stack()[0][3]
lineno = str(inspect.stack()[0][2])
print(mk_timestamp(), function_name, lineno + ':')
print(function_name + '.saveplot:', saveplot)
print(function_name + '.plotfile:', plotfile)
print(function_name + '.prefix: ', plotfile_prefix)
ndata = len(ra1)
# this could probably be simplified and speeded up
n = 0
xs = []
ys = []
while n < len(ra1):
x = (ra1[n] - ra2[n]) * \
math.cos((ra1[n] + ra2[n]) * math.pi / 360.0) * 3600.0
y = (dec1[n] - dec2[n]) * 3600.0
if not np.isnan(x) and not np.isnan(y):
xs.append(x)
ys.append(y)
n += 1
n = 0
xs_s = []
ys_s = []
if gtype == "square":
w = width / math.sqrt(2.0)
while n < len(xs):
x = xs[n]
y = ys[n]
if x <= w and x >= -w and y <= w and y >= -w:
xs_s.append(xs[n])
ys_s.append(ys[n])
n += 1
xs = xs_s
ys = ys_s
xs1 = list(xs) + []
ys1 = list(ys) + []
RA_med = np.median(xs1)
DEC_med = np.median(ys1)
RA_mad_std = mad_std(xs1)
DEC_mad_std = mad_std(ys1)
print("Number of points", len(xs))
print("RA median offset", RA_med, "Dec median offset", DEC_mad_std)
print("RA Sigma(MAD)", RA_mad_std, "Dec Sigma(MAD)", DEC_mad_std)
print("RA median error", RA_mad_std / math.sqrt(len(xs)),
"Dec median error", DEC_mad_std / math.sqrt(len(ys)))
print("dRA range:", np.min(xs1), np.max(xs1))
print("dDec range:", np.min(ys1), np.max(ys1))
print()
if len(xs) == 0:
print("No matches")
return RA_med, DEC_med
xs = np.asarray(xs)
ys = np.asarray(ys)
xlimits = np.asarray([-1.0*width, width])
ylimits = np.asarray([-1.0*width, width])
limits = np.asarray([xlimits, ylimits])
print(xlimits[0], xlimits[1])
print(xs.dtype)
print(xs.shape)
print(xlimits.dtype)
print(xlimits.shape)
# itest = (xs > xlimits[0] & xs < xlimits[1])
# xs = xs[itest]
# itest = (ys > ylimits[0] & ys < ylimits[1])
# ys = ys[itest]
print('limits:', limits)
gs = gridspec.GridSpec(2, 2, width_ratios=[2, 1], height_ratios=[1, 2])
fig = plt.figure(figsize=figsize)
ax1 = plt.subplot(gs[0])
ax1.hist(xs, bins=100, color="r", range=xlimits)
ax1.set_xlim(xlimits)
ax1.axes.get_xaxis().set_visible(False)
ax1.set_ylabel("Number")
ax2 = plt.subplot(gs[2])
# ax2.plot(xs, ys, "k+")
if len(xs) > 100:
plt.hist2d(xs, ys, bins=100,
cmap="binary",
norm=LogNorm(),
range=limits)
else:
plt.plot(xs, ys, "k.", ms=2)
ax2.set_ylim(-1*width, width)
ax2.set_xlim(-1*width, width)
ax2.set_xlabel('Delta RA /"')
ax2.set_ylabel('Delta Dec /"')
labels1 = ax2.get_xticks()
ax2.set_xticklabels(labels1, rotation=270)
if suptitle is None:
fig.suptitle("Errors in matching: " +
suptitle + ': ' + str(ndata), fontsize='small')
if suptitle is not None:
fig.suptitle(suptitle + ': ' + str(ndata), fontsize='small')
ax3 = plt.subplot(gs[3])
print('limits:', limits)
ax3.hist(ys, bins=100, orientation="horizontal", color="r",
range=ylimits)
ax3.set_ylim(ylimits)
ax3.set_xlabel("Number")
ax3.axes.get_yaxis().set_visible(False)
labels2 = ax3.get_xticks()
ax3.set_xticklabels(labels2, rotation=270)
ax4 = plt.subplot(gs[1])
ax4.annotate("Number of points: " +
str(len(xs)), xy=(0.01, 0.1), size="small")
ax4.annotate("RA offset: {0:.4f}".format(RA_med) +
'"', xy=(0.01, 0.90), size="small")
ax4.annotate("DEC offset: {0:.4f}".format(DEC_med) +
'"', xy=(0.01, 0.8), size="small")
ax4.annotate("RA sigma MAD: {0:.4f}".format(RA_mad_std) +
'"', xy=(0.01, 0.7), size="small")
ax4.annotate("DEC sigma MAD: {0:.4f}".format(DEC_mad_std) +
'"', xy=(0.01, 0.6), size="small")
ax4.annotate("RA median error: {0:.4f}".
format(RA_mad_std / math.sqrt(len(xs))) + '"',
xy=(0.01, 0.5), size="small")
ax4.annotate("DEC median error: {0:.4f}".
format(DEC_mad_std / math.sqrt(len(ys))) + '"',
xy=(0.01, 0.4), size="small")
ax4.annotate("RA sigma MAD: {0:.4f}".format(RA_mad_std) +
'"', xy=(0.01, 0.3), size="small")
ax4.annotate("DEC sigma MAD: {0:.4f}".format(DEC_mad_std) +
'"', xy=(0.01, 0.2), size="small")
ax4.axes.get_xaxis().set_visible(False)
ax4.axes.get_yaxis().set_visible(False)
if saveplot:
lineno = str(inspect.stack()[0][2])
print(mk_timestamp(), function_name, lineno)
print('plotfile:', plotfile)
print('plotfile_prefix:', plotfile_prefix)
if add_plotid:
# make room for the plotid on right edge
fig.subplots_adjust(right=0.95)
plotid()
if plotfile is None:
plotfile = 'match'
if plotfile_prefix is not None and plotfile is None:
plotfile = plotfile_prefix + '_match_' + datestamp + '.png'
if plotfile_prefix is None and plotfile is None:
plotfile = 'match_' + datestamp + '.png'
print('Saving: ', plotfile)
plt.savefig(plotfile)
plt.show()
return RA_med, DEC_med
def xmatch_cat(table1=None, table2=None,
radec1=None, radec2=None,
nthneighbor=None,
multimatch=False,
seplimit=10.0,
selfmatch=False,
colnames_radec1=['ra', 'dec'],
colnames_radec2=['ra', 'dec'],
units_radec1=['degree', 'degree'],
units_radec2=['degree', 'degree'],
stats=False,
debug=False,
verbose=False,
method=False):
"""RA, Dec nearest xmatch for two lists; returns pointers
nearest match
input can be an astropy table or zipped radec as a list
e.g.
c = zip([1],[1])
radec1 = zip(ra1 , dec1)
radec1 = np.column_stack(ra1, dec1))
Self match notes:
"""
import numpy as np
import matplotlib.pyplot as plt
from astropy.table import Table, hstack
from astropy.coordinates import SkyCoord
from astropy.coordinates import search_around_sky, match_coordinates_sky
from astropy import units as u
from astropy.stats import mad_std, median_absolute_deviation
if verbose or debug:
print('__file__:', __file__)
print('__name__:', __name__)
try:
if 'filename' in table1.meta:
print('table1.filename:', table1.meta['filename'])
except:
print("table1 has no metadata or table1.meta['filename']")
if verbose or debug:
print('colnames_radec1:', colnames_radec1)
table1.info()
# selfmatch does not need a 2nd table
if not selfmatch:
try:
if 'filename' in table2.meta:
print('table2.filename:', table2.meta['filename'])
except:
print("table2 has no metadata or table2.meta['filename']")
if verbose or debug:
print('colnames_radec2:', colnames_radec2)
table2.info()
if selfmatch:
table2 = table1
colnames_radec2 = colnames_radec1
if nthneighbor is None:
nthneighbor = 2
if nthneighbor is None:
nthneighbor = 1
ra1 = table1[colnames_radec1[0]]
dec1 = table1[colnames_radec1[1]]
if verbose or debug:
print('table1: ', colnames_radec1[0], table1[colnames_radec1[0]].unit)
print('table1: ', colnames_radec1[1], table1[colnames_radec1[1]].unit)
ra2 = table2[colnames_radec2[0]]
dec2 = table2[colnames_radec2[1]]
if verbose or debug:
print('table2: ', colnames_radec2[0], table2[colnames_radec2[0]].unit)
print('table2: ', colnames_radec2[1], table2[colnames_radec2[1]].unit)
if stats or verbose or debug:
print('RA1 range:', np.min(ra1), np.max(ra1))
print('Dec1 range:', np.min(dec1), np.max(dec1))
print('RA1 range:', np.min(ra2), np.max(ra2))
print('Dec1 range:', np.min(dec2), np.max(dec2))
skycoord1 = SkyCoord(ra1, dec1, unit=units_radec1, frame='icrs')
skycoord2 = SkyCoord(ra2, dec2, unit=units_radec2, frame='icrs')
# idx is an integer array into the second cordinate array to get the
# matched points for the second coordindate array.
# Shape of idx matches the first coordinate array
idx1 = []
idx2 = []
if not method:
if not multimatch:
idx2, d2d, d3d = \
match_coordinates_sky(skycoord1,
skycoord2,
nthneighbor=nthneighbor)
if multimatch:
idx1, idx2, d2d, d3d = \
search_around_sky(skycoord1,
skycoord2,
seplimit * u.arcsec)
# alternative 'method' form
if method:
if not multimatch:
idx2, d2d, d3d = \
skycoord1.match_to_catalog_sky(skycoord2,
nthneighbor=nthneighbor)
if multimatch:
idx1, idx2, d2d, d3d = \
skycoord1.search_around_sky(skycoord2,
seplimit * u.arcsec)
# compute the separations and
if not multimatch:
separation = skycoord1.separation(skycoord2[idx2])
dra, ddec = \
skycoord1.spherical_offsets_to(skycoord2[idx2])
if multimatch:
separation = skycoord1[idx1].separation(skycoord2[idx2])
dra, ddec = \
skycoord1[idx1].spherical_offsets_to(skycoord2[idx2])
if stats or verbose or debug:
print('multimatch:', multimatch)
print('seplimit:', seplimit)
print('len(table1):', len(table1))
print('len(table2):', len(table2))
print('len(idx1):', len(idx1))
print('len(idx2):', len(idx2))
print('idxmatch range:', np.min(idx2), np.max(idx2))
print('d2d range:', np.min(d2d), np.max(d2d))
print('d2d range:', np.min(d2d).arcsec, np.max(d2d).arcsec)
print('d2d median:', np.median(d2d).arcsec)
median_separation = np.median(separation).arcsec
mad_std_separation = mad_std(separation.arcsec)
print('dR range (arcsec):',
np.min(separation.arcsec), np.max(separation.arcsec))
print('dR mean, std (arcsec):',
np.mean(separation).arcsec, np.std(separation).arcsec)
print('dR median, mad_std (arcsec):',
median_separation, mad_std_separation)
print()
median_dra = np.median(dra).arcsec
mad_std_dra = mad_std(dra.arcsec)
print('dRA min, max:',
np.min(dra).arcsec, np.max(dra).arcsec)
print('dRA mean, std:',
np.mean(dra).arcsec, np.std(dra).arcsec)
print('dRA median, mad_std:',
median_dra, mad_std_dra)
print()
median_ddec = np.median(ddec).arcsec
mad_std_ddec = mad_std(ddec.arcsec)
print('dDec min, max:',
np.min(ddec).arcsec, np.max(ddec).arcsec)
print('dDec mean, std:',
np.mean(ddec).arcsec, np.std(ddec).arcsec)
print('dDec median, mad_std:',
median_ddec, mad_std_ddec)
print()
# convert to arcsec for convenience
separation = separation.arcsec
dr = d2d.arcsec
dra = dra.arcsec
ddec = ddec.arcsec
# return dra, ddec, dr in arcsec
# as a list or could be dict; check if scales from 10^3 -> 10^6 -> 10^9
drplus = [dra, ddec, dr]
if debug or verbose:
print(len(idx2), len(dr))
print(len(drplus), len(drplus[0]), len(drplus[1]), len(drplus[2]))
# could add option to return dr, dra, ddec
if not multimatch:
return idx2, dr, dra, ddec
if multimatch:
return (idx1, idx2), dr, dra, ddec
if debug:
help(xmatch_cat)
print("Elapsed time %.3f seconds" % (time.time() - t0))
"""RA, Dec nearest xmatch for two lists; returns pointers """
idxmatch, dr = xmatch_cat(table1=table1,
table2=table2,
colnames_radec1=colnames_radec1,
colnames_radec2=colnames_radec2,
selfmatch=False,
stats=True,
debug=debug,
verbose=True)
print("Elapsed time %.3f seconds" % (time.time() - t0))
dr_median = np.median(dr)
dr_mad_std = mad_std(dr)
numpoints = len(dr)
print(len(dr), dr_median, dr_mad_std)
itest = np.unique(idxmatch)
print('Unique idxmatch:', len(itest), len(idxmatch))
itest = np.unique(table1['row_id'])
print('Unique row_id:', len(itest))
for icount, id in enumerate(itest):
print(icount + 1, id,
mastercat['RA'][id], mastercat['Dec'][id])
precision = 1
print(icount + 1, id,
def make_hist(xdata=None, column=None, units=None, comment=None,
waveband=None,
figpath=None,
infile=None, filename=None, datapath=None,
zoom=False, save=True):
"""
make EDA univariate histogram plots
"""
fig = plt.figure(figsize=(8.0, 8.0))
# what does this do?
ids = np.where((xdata == xdata))[0]
xdata = xdata[ids]
pers = np.percentile(xdata, [1.0, 99.0])
keeps = np.where((xdata < pers[1]) & (xdata > pers[0]))[0]
if zoom and len(keeps) > 1:
xdata1 = xdata[keeps]
nper = len(xdata1)
ax1 = fig.add_subplot(121)
ax2 = fig.add_subplot(122, sharey=ax1)
ax2.get_yaxis().set_visible(False)
ax2.hist(xdata1, bins=100, log=True,
range=(min(xdata1), max(xdata1)))
ax2.set_title("1st - 99th %tile: " + str(nper))
labels2 = ax2.get_xticks()
ax2.set_xticklabels(labels2, rotation=270)
else:
ax1 = fig.add_subplot(111)
nr = len(xdata)
ax1.hist(xdata, bins=100, log=True,
range=(min(xdata), max(xdata)))
labels1 = ax1.get_xticks()[:-1]
ax1.set_xticklabels(labels1, rotation=270)
text = ("Min: " + str(min(xdata)) + "\nMax: " + str(max(xdata)) +
"\nMedian: " + str(np.median(xdata)) + "\nSigma MAD: " +
str(mad_std(xdata)) + "\n1st %ile: " +
str(pers[0]) + "\n99th %ile: " + str(pers[1]))
ax1.text(0.2, 0.7, text,
transform=ax1.transAxes, bbox=dict(facecolor='blue', alpha=0.2))
ax1.set_title("All points: " + str(nr))
text = column + " / " + units + "\n" + comment
ax1.text(0.5, 0.05, text,
ha="center", transform=fig.transFigure)
ax1.set_ylabel("Frequency")
print(column, filename, waveband)
fig.suptitle(column + ":" + filename + ':' + waveband, fontsize='small')
plt.subplots_adjust(left=0.1, right=0.9, top=0.9, bottom=0.2, wspace=0.0)
plotid()
fig = plt.gcf()
fig.set_size_inches(10.0, 8.0)
plotid()
if save:
basename=os.path.basename(infile)
figfile = figpath + '/' + basename + '_hist_' + column + ".png"
print('Saving:', figfile)
plt.savefig(figfile)
plt.close()
else:
plt.show()
#Iterate through the hours of one day
while hour.day == date.day:
index = hour.isoformat(" ").split(".")[0]
hour += datetime.timedelta(hours=1)
if not index in openfile:
continue
for b in openfile[index]:
block = openfile[index][b]
avg_revs.append(float(block["avg_revenue"]))
if block["avg_tips"] != "Insufficient data":
avg_tips.append(float(block["avg_tips"]))
avg_dists.append(float(block["avg_distance"]))
avg_pass.append(float(block["avg_passengers"]))
dist_list.append(float(block["distance"]))
tip_list.append(float(block["tips"]))
rev_list.append(float(block["revenue"]))
pass_list.append(float(block["passengers"]))
rides.append(float(block["rides"]))
date += datetime.timedelta(days=1)
with open("../statistics.csv", "w") as f:
writer = csv.writer(f)
writer.writerow(["Statistic", "Revenue", "Tips", "Distance", "Passengers", "Avg Revenue", "Avg Tips", "Avg Distance", "Avg Passengers", "Rides"])
writer.writerow(["Median", numpy.median(rev_list), numpy.median(tip_list), numpy.median(dist_list), numpy.median(pass_list), numpy.median(avg_revs), numpy.median(avg_tips), numpy.median(avg_dists), numpy.median(avg_pass), numpy.median(rides)])
writer.writerow(["Mean", numpy.mean(rev_list), numpy.mean(tip_list), numpy.mean(dist_list), numpy.mean(pass_list), numpy.mean(avg_revs), numpy.mean(avg_tips), numpy.mean(avg_dists), numpy.mean(avg_pass), numpy.mean(rides)])
writer.writerow(["Median Absolute Deviation", stats.mad_std(rev_list), stats.mad_std(tip_list), stats.mad_std(dist_list), stats.mad_std(pass_list), stats.mad_std(avg_revs), stats.mad_std(avg_tips), stats.mad_std(avg_dists), stats.mad_std(avg_pass), stats.mad_std(rides)])
writer.writerow(["Standard Deviation", numpy.std(rev_list), numpy.std(tip_list), numpy.std(dist_list), numpy.std(pass_list), numpy.std(avg_revs), numpy.std(avg_tips), numpy.std(avg_dists), numpy.std(avg_pass), numpy.std(rides)])
# file.write(print_line)
# file.close()
#
# import matplotlib.pylab as plt
# im2 = image
# im2[im2<=0]=0.0001
# plt.imshow(im2, cmap='gray', origin='lower')
# apertures.plot(color='blue', lw=1.5, alpha=0.5)
# plt.show()
hdulist = fits.open(inpath+file_name)
image = hdulist[0].data
#image = image.astype(float) - np.median(image)
from photutils import daofind
from astropy.stats import mad_std
bkg_sigma = mad_std(image)
sources = daofind(image, fwhm, threshold*bkg_sigma)
#print_line= (file_name+","+str(sources_2)+"\n")
sources_2 = np.array(sources["id", "xcentroid", "ycentroid", "sharpness", "roundness1", "roundness2", "npix", "sky", "peak", "flux", "mag"])
print_line= (file_name+","+str(sources_2))
file= open(outpath, "a")
file.write(print_line)
file.close()
from photutils import aperture_photometry, CircularAperture
positions = (sources['xcentroid'], sources['ycentroid'])
apertures = CircularAperture(positions, r)
phot_table = aperture_photometry(image, apertures)
phot_table_2 = np.array(phot_table["aperture_sum", "xcenter", "ycenter"])
print_line= (","+str(phot_table_2)+"\n")
file= open(outpath, "a")
def init_centroids(first_image_path, master_flat, master_dark, target_centroid,
max_number_stars=10, min_flux=0.2, plots=False):
first_image = np.median([(fits.getdata(path) - master_dark)/master_flat
for path in first_image_path], axis=0)
tophat_kernel = Tophat2DKernel(5)
convolution = convolve_fft(first_image, tophat_kernel, fftn=fft2, ifftn=ifft2)
convolution -= np.median(convolution)
mad = mad_std(convolution)
convolution[convolution < -5*mad] = 0.0
from skimage.filters import threshold_yen
from skimage.measure import label, regionprops
thresh = threshold_yen(convolution)/4 # Use /4 for planet c, /2 for planet b
#thresh = threshold_otsu(convolution)/15
masked = np.ones_like(convolution)
masked[convolution <= thresh] = 0
label_image = label(masked)
plt.figure()
plt.imshow(label_image, origin='lower', cmap=plt.cm.viridis)
plt.show()
# regions = regionprops(label_image, convolution)
regions = regionprops(label_image, first_image)
# reject regions near to edge of detector
buffer_pixels = 50
regions = [region for region in regions
if ((region.weighted_centroid[0] > buffer_pixels and
region.weighted_centroid[0] < label_image.shape[0] - buffer_pixels)
and (region.weighted_centroid[1] > buffer_pixels and
region.weighted_centroid[1] < label_image.shape[1] - buffer_pixels))]
#centroids = [region.weighted_centroid for region in regions]
#intensities = [region.mean_intensity for region in regions]
target_intensity = regions[0].mean_intensity
target_diameter = regions[0].equivalent_diameter
# and region.equivalent_diameter > 0.8 * target_diameter
centroids = [region.weighted_centroid for region in regions
if min_flux * target_intensity < region.mean_intensity]
# intensities = [region.mean_intensity for region in regions
# if min_flux * target_intensity < region.mean_intensity]
# centroids = np.array(centroids)[np.argsort(intensities)[::-1]]
distances = [np.sqrt((target_centroid[0] - d[0])**2 +
(target_centroid[1] - d[1])**2) for d in centroids]
centroids = np.array(centroids)[np.argsort(distances)]
positions = np.vstack([[y for x, y in centroids], [x for x, y in centroids]])
if plots:
apertures = CircularAperture(positions, r=12.)
apertures.plot(color='r', lw=2, alpha=1)
plt.imshow(first_image, vmin=np.percentile(first_image, 0.01),
vmax=np.percentile(first_image, 99.9), cmap=plt.cm.viridis,
origin='lower')
plt.scatter(positions[0, 0], positions[1, 0], s=150, marker='x')
plt.show()
return positions
def xmatch_checkplots0(ra1, dec1, ra2, dec2,
width=10.0,
binsize=1.0,
saveplot=True,
markersize=1.0,
plotfile='',
suptitle='',
**kwargs):
"""
Based on code by Chris Desira
"""
import numpy as np
import matplotlib.pyplot as plt
from astropy import stats
from astropy.coordinates import SkyCoord
from astropy import units as u
from librgm.plotid import plotid
rmax = width
print('RA1 range:', np.min(ra1), np.max(ra1))
print('Dec1 range:', np.min(dec1), np.max(dec1))
print('RA2 range:', np.min(ra2), np.max(ra2))
print('Dec2 range:', np.min(dec2), np.max(dec2))
# offsets in arc seconds
difference_ra = (ra1 - ra2) * np.cos(np.radians(dec1)) * 3600.0
difference_dec = (dec1 - dec2) * 3600.0
itest = (np.abs(difference_ra) < rmax) & (np.abs(difference_dec) < rmax)
difference_ra = difference_ra[itest]
difference_dec = difference_dec[itest]
skycoord_object1 = SkyCoord(ra1, dec1, unit=('degree', 'degree'),
frame='icrs')
skycoord_object2 = SkyCoord(ra2, dec2, unit=('degree', 'degree'),
frame='icrs')
skycoord_object1 = skycoord_object1[itest]
skycoord_object2 = skycoord_object2[itest]
separations = skycoord_object1.separation(skycoord_object2)
med = np.median(separations.arcsec)
ndata = len(separations)
mad = stats.median_absolute_deviation(separations.arcsec)
mad_std = stats.mad_std(separations.arcsec)
fig = plt.figure(1, figsize=(10, 5))
plt.suptitle(suptitle, size=10)
ax1=fig.add_subplot(1,2,1)
xdata = separations.arcsec
n, b, patches = ax1.hist(xdata, bins=rmax/binsize,
range=[0.0, rmax],
color='green', alpha=0.5)
bin_min = np.where(n == n.min())
ax1.locator_params(axis='x', nbins=4)
s04 = '# = %i'% ndata
ax1.annotate(s04,(0.28,0.90) , xycoords = 'axes fraction',size=8)
s01 = 'Median = %.2f' % med
ax1.annotate(s01,(0.28,0.85) , xycoords = 'axes fraction',size=8)
ax1.set_xlabel('Pariwise separation (arcsec)')
ax1.set_ylabel('Frequency per bin')
ax2 = fig.add_subplot(1,2,2, aspect='equal')
alpha = 1.0
ax2.plot(difference_ra,difference_dec,'oc',
markersize=markersize,
markeredgewidth=0.0,
alpha=alpha) #0.5 smallest size
ax2.axis([-1.0*rmax, rmax,-1.0*rmax, rmax])
ax2.locator_params(axis='x',nbins=4)
ax2.set_xlabel('Delta RA')
ax2.set_ylabel('Delta Dec')
s11 = 'Self-xmatch'
ax2.annotate(s11,(0.45,0.95) , xycoords = 'axes fraction',size=8)
s1 = '# of Objects = %i' % ndata
ax2.annotate(s1,(0.45,0.90) , xycoords = 'axes fraction',size=8)
s7 = 'MAD = %.2f' % mad
ax2.annotate(s7,(0.45,0.85) , xycoords = 'axes fraction',size=8)
s3 = 'sigma_MAD = %.2f' % mad_std
ax2.annotate(s3,(0.45,0.80) , xycoords = 'axes fraction',size=8)
fig.tight_layout()
ax2.grid()
fig.subplots_adjust(top=0.88)
# make room for the plotid on right edge
fig.subplots_adjust(right=0.95)
plotid()
if plotfile != None:
print('Saving plotfile:', plotfile)
plt.savefig(plotfile)
if ('save' in kwargs):
path_to_save = str(kwargs['save'])
plt.savefig(path_to_save, dpi=150)
else:
plt.show()
def add_columns_spherical_offsets(table=None,
ra1=None, dec1=None,
ra2=None, dec2=None,
colname_suffix=None,
plot_drarange=None,
plot_ddecrange=None,
plots=False,
colnames=None,
verbose=False,
**kwargs):
"""
input is ra1, dec1, ra2, ra2 in pairwise match order
http://docs.astropy.org/en/stable/api/astropy.table.Table.html#astropy.table.Table.add_columns
http://docs.astropy.org/en/stable/api/astropy.coordinates.SkyCoord.html
http://docs.astropy.org/en/stable/coordinates/matchsep.html
http://docs.astropy.org/en/stable/api/astropy.coordinates.SkyCoord.html#astropy.coordinates.SkyCoord.position_angle
plots are based on cdesira code
"""
if verbose:
if 'filename' in data.meta:
print('filename:', filename)
print('ra1 range:', np.min(ra1), np.max(ra1))
print('dec1 range:', np.min(dec1), np.max(dec1))
print('ra2 range:', np.min(ra2), np.max(ra2))
print('dec2 range:', np.min(dec2), np.max(dec2))
# I am not sure whether/why the next part is needed or working
# convert ra, dec to units of deg since SkyCoord defaults to def
# technically this is not needed for the astropy matching since
# astropy supports units
try:
if ra1.unit != 'deg':
ra1 = ra1 * u.deg
except:
# ra1.unit = 'deg'
pass
try:
if dec1.unit != 'deg':
dec1 = dec1 * u.deg
except:
pass
print(type(ra1), len(ra1))
print(type(dec1), len(dec1))
c1 = SkyCoord(ra=ra1, dec=dec1)
if ra2.unit != 'deg':
ra2 = ra2 * u.deg
if dec2.unit != 'deg':
dec2 = dec2 * u.deg
c2 = SkyCoord(ra=ra2, dec=dec2)
if verbose:
print('ra1 range:', np.min(ra1), np.max(ra1))
print('dec1 range:', np.min(dec1), np.max(dec1))
print('ra2 range:', np.min(ra2), np.max(ra2))
print('dec2 range:', np.min(dec2), np.max(dec2))
print()
dra, ddec = c1.spherical_offsets_to(c2)
sep = c1.separation(c2)
pa = c1.position_angle(c2)
# compute the statistics
print('stats: n, min, max, mean, median, rms, mad_rms')
sep_mad_std = apstats.mad_std(sep)
print('sep:', len(sep), np.min(sep.arcsec), np.max(sep.arcsec),
np.mean(sep.arcsec), np.median(sep.arcsec),
np.std(sep.arcsec), apstats.mad_std(sep.arcsec))
print('pa: ', len(pa), np.min(pa.deg), np.max(pa.deg),
np.mean(pa.deg), np.median(pa.deg),
np.std(pa.deg), apstats.mad_std(pa.deg))
print('dra: ', len(dra.arcsec), np.min(dra.arcsec), np.max(dra.arcsec),
np.mean(dra.arcsec), np.median(dra.arcsec),
np.std(dra.arcsec), apstats.mad_std(dra.arcsec))
print('ddec:', len(ddec), np.min(ddec.arcsec), np.max(ddec.arcsec),
np.mean(ddec.arcsec), np.median(ddec.arcsec),
np.std(ddec.arcsec), apstats.mad_std(ddec.arcsec))
print()
# need to move these outside this function for portability
if plots:
# drarange=[-0.5, 0.5]
# ddecrange=[-0.5, 0.5]
alpha = 1.0
markersize = 4.0
plt.figure(1, figsize=(8.0, 8.0))
ndata = len(dra)
plt.plot(dra.arcsec, ddec.arcsec,
'oc',
markersize=markersize, markeredgewidth=0.0,
alpha=alpha, label=str(ndata))
plt.xlabel('dra (")')
plt.ylabel('ddec (")')
if plot_drarange is not None:
plt.xlim(plot_drarange)
if plot_ddecrange is not None:
plt.ylim(plot_ddecrange)
plt.grid()
plt.legend()
plotid()
dra_mean = np.mean(dra.arcsec)
dra_median = np.median(dra.arcsec)
dra_std = np.std(dra.arcsec)
dra_mad_std = apstats.mad_std(dra.arcsec)
ddec_mean = np.mean(ddec.arcsec)
ddec_median = np.median(ddec.arcsec)
ddec_std = np.std(ddec.arcsec)
ddec_mad_std = apstats.mad_std(ddec.arcsec)
s0 = ' dra, ddec'
plt.annotate(s0,(0.05,0.98) , xycoords = 'axes fraction',size=12)
s1 = 'mean = %.3f, %.3f'% (dra_mean, ddec_mean)
plt.annotate(s1,(0.05,0.94) , xycoords = 'axes fraction',size=12)
s2 = 'median = %.3f, %.3f'% (dra_median, ddec_median)
plt.annotate(s2,(0.05,0.90) , xycoords = 'axes fraction',size=12)
s3 = 'std = %.3f, %.3f' % (dra_std, ddec_std)
plt.annotate(s3,(0.05,0.86) , xycoords = 'axes fraction',size=12)
s4 = 'mad_std = %.3f, %.3f' % (dra_mad_std, ddec_mad_std)
plt.annotate(s4,(0.05,0.82) , xycoords = 'axes fraction',size=12)
if ('plot_title' in kwargs):
plt.title(str(kwargs['plot_title']), fontsize='medium')
if ('plot_suptitle' in kwargs):
plt.suptitle(str(kwargs['plot_suptitle']), fontsize='medium')
plt.show()
if colname_suffix is None:
colname_suffix = ''
if colname_suffix is not None:
colname_suffix = '_' + colname_suffix
# maybe should be in degrees
table['dRA' + colname_suffix] = dra.arcsec
table['dDec' + colname_suffix] = ddec.arcsec
table['dR' + colname_suffix] = sep.arcsec
table['PA' + colname_suffix] = pa.deg
return table
def printfc(self,outname,annotate=True,cntr=4.0):
"""
Generate finder
outname: name of output
annotate: if True, add info to finder
cntr: number of sigma sky for display contrast
"""
#display image
fig = plt.figure(figsize=(8,10),dpi=80)
ax = fig.add_subplot(111,projection=self.w)
mean=np.median(self.img)
stdev=mad_std(self.img)
imgplot = ax.imshow(self.img,origin='low',cmap='gray_r',
clim=(mean-cntr*stdev,mean+cntr*stdev))
if(annotate):
#make annotations
#mark position obj
Ax,Ay = wcs.utils.skycoord_to_pixel(self.obj,self.w)
p=patches.Circle((Ax,Ay),2.0/self.scale,edgecolor='red',
linewidth=3,facecolor='none')
ax.add_patch(p)
txt=self.obj.to_string(style='hmsdms',sep=':',precision=3)
plt.text(0.5, 0.95,"Object: "+txt, horizontalalignment='center',
verticalalignment='center',transform=fig.transFigure,\
fontsize=22,color='red')
#mark position offset
if(self.off):
Bx,By = wcs.utils.skycoord_to_pixel(self.off,self.w)
p=patches.Circle((Bx,By),2.0/self.scale,edgecolor='blue',
linewidth=3,facecolor='none')
ax.add_patch(p)
txt=self.off.to_string(style='hmsdms',sep=':',precision=3)
plt.text(0.5, 0.9,"Offset: "+txt, horizontalalignment='center',
verticalalignment='center',transform=fig.transFigure,
fontsize=22,color='blue')
#offsets
ra_offset = (((self.off.ra - self.obj.ra) * np.cos(self.obj.dec.to('radian'))).to('arcsec')).value
dec_offset = (((self.off.dec - self.obj.dec)).to('arcsec')).value
posang=self.obj.position_angle(self.off).degree
strng=r'$\alpha$:{:8.2f}" $\delta$:{:8.2f}" PA:{:6.1f} m:{:4.1f}'.\
format(ra_offset,dec_offset,posang,self.offmag)
plt.text(0.5, 0.84,strng, horizontalalignment='center',
verticalalignment='center',transform=fig.transFigure,
fontsize=25)
#mark north east
plt.text(self.img.shape[0]/2.,self.img.shape[1],'North',
horizontalalignment='center',
verticalalignment='top',fontsize=25)
plt.text(0.,self.img.shape[1]/2.,'East',
horizontalalignment='left',rotation='vertical',
verticalalignment='center',fontsize=25)
#save
plt.savefig(outname)
def xmatch_groups(table1=None, table2=None,
colnames_radec1=['ra', 'dec'],
colnames_radec2=['ra', 'dec'],
units_radec1=['degree', 'degree'],
units_radec2=['degree', 'degree'],
selfmatch=False,
rmin=None,
rmax=10.0,
stats=True,
debug=False,
verbose=False,
checkplot=True,
join=False,
plot_title=None,
plotfile_label=''):
"""Group RA, Dec xmatch for two lists; returns pointers
Topcat
http://www.star.bris.ac.uk/~mbt/topcat/sun253/sun253.html#matchAlgorithm
http://www.star.bris.ac.uk/~mbt/topcat/sun253/sun253.html#matchCriteria
all matchs within a radius
https://www.sites.google.com/site/mrpaulhancock/blog/theage-oldproblemofcross-matchingastronomicalsources
http://www.astropy.org/astropy-tutorials/Coordinates.html
see:
http://docs.astropy.org/en/stable/_modules/astropy/table/groups.html
Self match notes:
"""
import numpy as np
import matplotlib.pyplot as plt
from astropy.table import Table, Column, hstack
from astropy.coordinates import SkyCoord
from astropy.coordinates import search_around_sky, match_coordinates_sky
from astropy import units as u
from astropy.stats import mad_std, median_absolute_deviation
from librgm.plotid import plotid
print('__file__:', __file__)
print('__name__:', __name__)
print('colnames_radec1:', colnames_radec1)
print('colnames_radec2:', colnames_radec2)
print('plotfile_label:', plotfile_label)
import xmatch_checkplot
import xmatch_checkplot0
if selfmatch:
table2 = table1
colnames_radec2 = colnames_radec1
ra1 = table1[colnames_radec1[0]]
dec1 = table1[colnames_radec1[1]]
ra2 = table2[colnames_radec2[0]]
dec2 = table2[colnames_radec2[1]]
if stats or verbose or debug:
print('RA1 range:', np.min(ra1), np.max(ra1))
print('Dec1 range:', np.min(dec1), np.max(dec1))
print('RA1 range:', np.min(ra2), np.max(ra2))
print('Dec1 range:', np.min(dec2), np.max(dec2))
skycoord1 = SkyCoord(ra1, dec1, unit=units_radec1, frame='icrs')
skycoord2 = SkyCoord(ra2, dec2, unit=units_radec1, frame='icrs')
"""
idx is an integer array into the first cordinate array to get the
matched points for the second coorindate array.
Shape of idx matches the first coordinate array
http://docs.astropy.org/en/stable/api/astropy.coordinates.search_around_sky.html
astropy.coordinates.search_around_sky(
coords1, coords2, seplimit, storekdtree='kdtree_sky'
Returns:
idx1 : integer array
Indices into coords1 that matches to the corresponding element of
idx2. Shape matches idx2.
idx2 : integer array
Indices into coords2 that matches to the corresponding element of
idx1. Shape matches idx1.
sep2d : Angle
The on-sky separation between the coordinates. Shape matches idx1 and idx2.
"""
idxmatch1, idxmatch2, d2d, d3d = \
skycoord1.search_around_sky(skycoord2,
rmax * u.arcsec)
if selfmatch:
itest = idxmatch1 != idxmatch2
print('selfmatch: Number of matchs within rmax:',
len(idxmatch1[itest]), len(table1), rmax)
idxmatch1 = idxmatch1[itest]
idxmatch2 = idxmatch2[itest]
d2d = d2d[itest]
d3d = d3d[itest]
isort = np.argsort(idxmatch1)
idxmatch1 = idxmatch1[isort]
idxmatch2 = idxmatch2[isort]
separation = skycoord1[idxmatch1].separation(skycoord2[idxmatch2])
pa = skycoord1[idxmatch1].position_angle(skycoord2[idxmatch2])
dra, ddec = \
skycoord1[idxmatch1].spherical_offsets_to(skycoord2[idxmatch2])
print(len(idxmatch1), np.min(idxmatch1), np.max(idxmatch1))
idxmatch1_unique, index, counts = np.unique(
idxmatch1, return_index=True, return_counts=True)
data = counts
binwidth = 1
ndata = np.sum(counts)
print(len(data), data.shape, np.min(data), np.max(data))
plt.hist(data, bins=range(min(data), max(data) + binwidth, binwidth),
label=str(ndata))
if plot_title is not None:
plt.title(plot_title)
plt.xlabel('Group size')
plt.ylabel('Frequency')
plt.legend()
plotid()
plt.show()
idxmatch2_unique, index, counts = np.unique(
idxmatch2, return_index=True, return_counts=True)
data = counts
binwidth = 1
ndata=np.sum(counts)
print(len(data), np.min(data), np.max(data))
plt.hist(data,
bins=range(min(data), max(data) + binwidth, binwidth),
label=str(ndata))
if plot_title is not None:
plt.title(plot_title)
plt.xlabel('Group size')
plt.ylabel('Frequency')
plotid()
plt.legend()
plt.show()
print('table1 columns:', len(table1.colnames))
print('table2 columns:', len(table2.colnames))
# result = hstack([table1[idxmatch1], table1[idxmatch2]])
# print('result columns:', len(result.colnames))
# nrows = len(result)
xmatch1 = table1[idxmatch1]
xmatch2 = table2[idxmatch2]
nrows = len(xmatch1)
groupid = np.empty(nrows, dtype=int)
groupsize = np.zeros(nrows, dtype=int)
for isource, idxsource in enumerate(idxmatch1):
if isource == 0:
igroup = 1
groupid[isource] = igroup
if groupsize[isource] == 0:
groupsize[isource] = 2
if isource != 0:
if idxmatch1[isource] == idxmatch1[isource - 1]:
groupsize[isource] = groupsize[isource - 1] + 1
groupid[isource] = groupid[isource - 1]
if idxmatch1[isource] != idxmatch1[isource - 1]:
groupsize[isource] = 2
igroup = igroup + 1
groupid[isource] = igroup
print('Group size range:', np.min(groupsize), np.max(groupsize))
for igroupsize in range(np.max(groupsize) + 1):
itest = (groupsize == igroupsize)
print('groups:', igroupsize, len(groupsize[itest]))
# remove simple mirror pairs
# for isource, source in enumerate(result):
# if
key=raw_input("Enter any key to continue: ")
id = np.linspace(1, nrows, num=nrows, dtype=int)
print('id range:', np.min(id), np.max(id), len(id))
# print('id:', len(result), len(id), np.min(id), np.max(id))
id = Column(id, name='id')
# result.add_column(id, index=0) # Insert before the first table column
xmatch1.add_column(id, index=0)
groupid = Column(groupid, name='groupid')
# result.add_column(groupid, index=1)
xmatch1.add_column(groupid, index=1)
groupsize = Column(groupsize, name='groupsize')
# result.add_column(groupsize, index=2)
xmatch1.add_column(groupsize, index=2)
xmatch1.add_column(Column(separation.arcsec, name='dR_1_2'), index=3)
# xmatch1['dr_1_2'] = separation.arcsec
xmatch1.add_column(Column(pa.degree, name='PA_1_2'), index=4)
# xmatch1['PA_1_2'] = pa.degree
xmatch1.add_column(Column(dra.arcsec, name='dRA_1_2'), index=5)
xmatch1.add_column(Column(ddec.arcsec, name='dDec_1_2'), index=6)
# xmatch1['dRA_1_2'] = dra.arcsec
# xmatch1['dDec_1_2'] = ddec.arcsec
xmatch1.info('stats')
print('Number of rows:', len(xmatch1))
#result.info('stats')
# exclude duplicates or small separation objects
if rmin is not None:
itest = (xmatch1['dR_1_2'] > rmin)
xmatch1 = xmatch1[itest]
xmatch1.write('closepair_groups.fits', overwrite=True)
# result.write('result_join.fits')
result = xmatch1
key=raw_input("Enter any key to continue: ")
idxmatch2_unique = np.unique(idxmatch2)
print('Number of unique idxmatch1:', len(idxmatch1_unique))
print('Number of unique idxmatch2:', len(idxmatch2_unique))
if stats or verbose or debug:
print('len(table1):', len(table1))
print('len(table2):', len(table2))
print()
print('len(idxmatch1):', len(idxmatch1))
print('idxmatch1 range:', np.min(idxmatch1), np.max(idxmatch1))
print()
print('len(idxmatch2):', len(idxmatch2))
print('idxmatch1 range:', np.min(idxmatch2), np.max(idxmatch2))
print()
print('d2d range (arcsec):', np.min(d2d).arcsec, np.max(d2d).arcsec)
print('d2d median (arcsec):', np.median(d2d).arcsec)
median_separation = np.median(separation).arcsec
mad_std_separation = mad_std(separation.arcsec)
print('dR range (arcsec):',
np.min(separation.arcsec), np.max(separation.arcsec))
print('dR mean, std (arcsec):',
np.mean(separation).arcsec, np.std(separation).arcsec)
print('dR median, mad_std (arcsec):',
median_separation, mad_std_separation)
print()
median_dra = np.median(dra).arcsec
mad_std_dra = mad_std(dra.arcsec)
print('dRA min, max:',
np.min(dra.arcsec), np.max(dra.arcsec))
print('dRA mean, std:',
np.mean(dra.arcsec), np.std(dra.arcsec))
print('dRA median, mad_std:',
median_dra, mad_std_dra)
print()
median_ddec = np.median(ddec).arcsec
mad_std_ddec = mad_std(ddec.arcsec)
print('dDec min, max:',
np.min(ddec).arcsec, np.max(ddec).arcsec)
print('dDec mean, std:',
np.mean(ddec).arcsec, np.std(ddec).arcsec)
print('dDec median, mad_std:',
median_ddec, mad_std_ddec)
print()
if checkplot:
suptitle = plotfile_label
plotfile = 'xmatch_cat' + plotfile_label + '_a_checkplot.png'
ra2_xmatch = ra2[idxmatch2]
dec2_xmatch = dec2[idxmatch2]
xmatch_checkplot.xmatch_checkplot(
ra1, dec1, ra2_xmatch, dec2_xmatch,
width=rmax,
gtype='square',
saveplot=True,
plotfile=plotfile,
suptitle=suptitle)
plt.close()
plotfile = 'xmatch_cat' + plotfile_label + '_b_checkplot0.png'
xmatch_checkplot0.xmatch_checkplot0(
ra1, dec1, ra2_xmatch, dec2_xmatch,
width=10.0,
gtype='square',
saveplot=True,
plotfile=plotfile,
suptitle=suptitle)
plt.close()
separation = separation.arcsec
dr = d2d.arcsec
print(len(idxmatch1), len(idxmatch2), len(dr))
return result, idxmatch1, idxmatch2, d2d.arcsec
def calc_background_rms(self, data):
return mad_std(self.sigma_clip(data))
def multi_night(sources, unique_nights, night,
brightest_mag, mags, mag_err,
uniform_ylim=True):
"""
Plot magnitude vs time data for several sources over several nights
"""
number_of_nights = len(unique_nights)
for source in sources:
f = plt.figure(figsize=(5 * number_of_nights, 5))
night_means = []
night_stds = []
night_bins = []
source_mags = mags[source.id - 1]
if uniform_ylim:
# Use median to handle outliers.
source_median = np.median(source_mags[np.isfinite(source_mags)])
# Use median absolute deviation to get measure of scatter.
# Helps avoid extremely points.
source_variation = 3 * mad_std(source_mags[np.isfinite(source_mags)])
# Ensure y range will be at least 0.2 magnitudes
if source_variation < 0.1:
half_range = 0.1
else:
half_range = source_variation
y_range = (source_median - half_range, source_median + half_range)
else:
# Empty if this option wasn't chosen so that automatic limits will be used.
y_range = []
last_axis = None
for i, this_night in enumerate(unique_nights):
last_axis = plt.subplot(1, number_of_nights + 1, i + 1,
sharey=last_axis)
night_mask = (night == this_night)
night_mean, night_std = plot_magnitudes(mags=mags[source.id - 1][night_mask],
errors=mag_err[source.id - 1][night_mask],
times=source.bjd_tdb[night_mask],
source=source.id, night=this_night,
ref_mag=brightest_mag,
y_range=y_range)
night_means.append(night_mean)
night_stds.append(night_std)
night_bins.append(this_night)
plt.subplot(1, number_of_nights + 1, number_of_nights + 1)
if uniform_ylim:
f.subplots_adjust(wspace=0)
plt.setp([a.get_yticklabels() for a in f.axes[1:]], visible=False)
# Plot indicators of variation, and information about this source.
# For simplicity, make the x and y range of this plot be 0 to 1.
x = np.array([0., 1])
y = x
# Add invisible line to make plot.
plt.plot(x, y, alpha=0, label='source {}'.format(source.id))
night_means = np.array(night_means)
# Plot bar proportional to Lomb-Scargle power.
bad_mags = (np.isnan(mags[source.id - 1]) |
np.isinf(mags[source.id - 1]))
bad_errs = (np.isnan(mag_err[source.id - 1]) |
np.isinf(mag_err[source.id - 1]))
bads = bad_mags | bad_errs
good_mags = ~bads
model = LombScargleFast().fit(source.bjd_tdb[good_mags],
mags[source.id - 1][good_mags],
mag_err[source.id - 1][good_mags])
periods, power = model.periodogram_auto(nyquist_factor=100,
oversampling=3)
max_pow = power.max()
# print(source, max_pow)
if max_pow > 0.5:
color = 'green'
elif max_pow > 0.4:
color = 'cyan'
else:
color = 'gray'
bar_x = 0.25
plt.plot([bar_x, bar_x], [0, max_pow],
color=color, linewidth=10, label='LS power')
plt.legend()
# Add dot for magnitude of star.
size = 10000./np.abs(10**((source_median - brightest_mag)/2.5))
plt.scatter([0.8], [0.2], c='red', marker='o', s=size)
plt.ylim(0, 1)
"""RA, Dec nearest xmatch for two lists; returns pointers """
print('table1 selfxmatch')
t0 = time.time()
idx, dr, dra, ddec = xmatch_cat(table1=table1,
selfmatch=True,
stats=True,
debug=False,
verbose=True)
print("Elapsed time %.3f seconds" % (time.time() - t0))
if args.debug:
raw_input('Type any key to continue> ')
dr_mean = np.average(dr)
dr_median = np.median(dr)
dr_mad_std = mad_std(dr)
numpoints = len(dr)
plt.figure(figsize=(12, 4))
plt.subplot(1, 3, 1)
"""Default is taken from the rcParam hist.bins."""
prefix = os.path.basename(__file__)
plt.suptitle(prefix + ': ' + 'dr histogram')
plot_label = ("npts: {}".format(numpoints) + '\n' +
"mean: {:.2f} arcsec".format(dr_mean) + '\n' +
"median: {:.2f} arcsec".format(dr_median) + '\n' +
"mad_std: {:.2f} arcsec".format(dr_mad_std))
n_bins = 100
plt.hist(dr, bins=n_bins, fill=False, histtype='step',
def des_get_cutout(infile=None, data=None, ext=1, header=None,
AstWCS=None,
position=None, format='pixels', size=100,
title=None, suptitle=None,
imagetype='data',
segmap=False, weightmap=False,
plot=False, saveplot=True,
plotfile_suffix=None, plotfile_prefix=None,
verbose=False, debug=False):
"""
"""
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
from astropy.nddata.utils import Cutout2D
from astropy.io import fits
from astropy import wcs
from astropy.stats import mad_std
from librgm.plotid import plotid
print('position: ', position[0], position[1])
position = np.rint(position)
print('position: ', position[0], position[1])
if infile is not None:
hdulist = fits.open(infile)
hdulist.info()
AstWCS = wcs.WCS(hdulist[ext].header)
xpix0 = np.rint(position[0]) - (size/2)
ypix0 = np.rint(position[1]) - (size/2)
xpix0 = xpix0.astype(int)
ypix0 = ypix0.astype(int)
print('xpix0, ypix0: ', xpix0, ypix0)
xpix1 = xpix0 + size
ypix1 = ypix0 + size
data = hdulist[ext].data[ypix0:ypix1, xpix0:xpix1]
if debug: help(data)
print('data.shape: ', data.shape)
median=np.median(data)
print('median.shape: ', median.shape)
print('median: ', median)
if segmap:
# determine the list of unique sources in the segmentation image
unique_sources = np.unique(data)
nsources = len(unique_sources)
print('Number of unique segmented sources: ', nsources)
print(unique_sources)
isource = 1
# skip the first with value = zero which is background
for unique_source in unique_sources[1:]:
isource = isource + 1
print(isource, unique_source)
index = np.where(data == unique_source)
print(index)
data[index] = isource
if ext != 2:
itest = data > 0.5
print('min: ', np.min(data[itest]))
threshold = np.min(data[itest]) - 1
print('threshold: ', threshold)
print('max: ', np.max(data))
mad_stdev = mad_std(data)
print('mad_std:', mad_stdev)
if ext != 2:
data = data - threshold
itest = data < 0
data[itest] = 0
median=np.median(data)
print('median: ', median)
position = (size/2, size/2)
cutout = Cutout2D(data, position, size)
if debug: help(cutout)
if plot:
plt.figure(figsize=(8,6))
cmap = mpl.cm.jet
if segmap:
#cmap = mpl.cm.jet_r
#cmap.set_under(color='w')
#cmax = np.max(data)
#cmap.set_clim(1,cmax)
#itest = data > 0.5
#data[itest] = np.nan
data = np.ma.masked_where(data < 0.5, data)
cmap.set_bad('w')
#plt.imshow(cutout.data, origin='lower', interpolation='nearest')
plt.imshow(data, origin='lower', interpolation='nearest',
cmap=cmap)
if not segmap:
crange = 50
if weightmap:crange = 10
lower = -1.0
vmin = median + (lower * mad_stdev)
vmax= min([median+(crange*mad_stdev),max])
plt.imshow(data, origin='lower', interpolation='nearest',
cmap=cmap,
vmin=vmin, vmax=vmax)
plt.gca().invert_xaxis()
plt.xlabel('pixels')
plt.ylabel('pixels')
if title is not None: plt.title(title)
if suptitle is not None: plt.suptitle(suptitle)
plt.colorbar()
plotid()
if saveplot:
plotfile = 'cutout'
if segmap:
plotfile = 'cutout_segmap'
if weightmap:
plotfile = 'cutout_weightmap'
if plotfile_suffix is not None:
plotfile = plotfile + '_' + plotfile_suffix
if plotfile_prefix is not None:
plotfile = plotfile_prefix + '_' + plotfile
plotfile = plotfile + '.png'
print('Saving :', plotfile)
plt.savefig(plotfile)
plt.show()
return cutout.data
from toolkit import PCA_light_curve, PhotometryResults
from toolkit.transit_model import params_c, transit_model_c_depth_t0
import astropy.units as u
from astropy.stats import mad_std
samples = np.load('outputs/samples_c.npy')[1000:, :]#np.loadtxt('outputs/samples_converged.txt')
path = 'outputs/trappist1c_20160619.npz'
phot_results = PhotometryResults.load(path)
times = phot_results.times
transit_parameters = params_c
light_curve = PCA_light_curve(phot_results, transit_parameters,
validation_duration_fraction=0.5, plots=False,
plot_validation=False, validation_time=0.9,
outlier_rejection=False)
light_curve_errors = np.ones_like(light_curve) * mad_std(light_curve)
init_transit_model = transit_model_c_depth_t0(times, params_c.rp**2, params_c.t0)
residuals = light_curve - init_transit_model
n_iterations = 5
inliers = np.zeros_like(residuals).astype(bool)
while np.count_nonzero(~inliers) > 0:
inliers = np.abs(residuals) < 2.5*mad_std(residuals)
print('remove {0}'.format(np.count_nonzero(~inliers)))
times = times[inliers]
light_curve = light_curve[inliers]
light_curve_errors = light_curve_errors[inliers]
residuals = residuals[inliers]