def _procOneVoxelFitcorrx(vox,
corr_y,
lagtcgenerator,
timeaxis,
thefitter,
disablethresholds=False,
despeckle_thresh=5.0,
initiallag=None,
fixdelay=False,
fixeddelayvalue=0.0,
rt_floatset=np.float64,
rt_floattype='float64'):
maxindex, maxlag, maxval, maxsigma, maskval, peakstart, peakend, failreason = onecorrfitx(corr_y,
thefitter,
disablethresholds=disablethresholds,
despeckle_thresh=despeckle_thresh,
fixdelay=fixdelay,
fixeddelayvalue=fixeddelayvalue,
initiallag=initiallag,
rt_floatset=rt_floatset,
rt_floattype=rt_floattype)
if maxval > 0.3:
displayplots = False
# question - should maxlag be added or subtracted? As of 10/18, it is subtracted
# potential answer - tried adding, results are terrible.
thelagtc = rt_floatset(lagtcgenerator.yfromx(timeaxis - maxlag))
# now tuck everything away in the appropriate output array
volumetotalinc = 0
thewindowout = rt_floatset(0.0 * corr_y)
thewindowout[peakstart:peakend + 1] = 1.0
if (maskval == 0) and thefitter.zerooutbadfit:
thetime = rt_floatset(0.0)
thestrength = rt_floatset(0.0)
thesigma = rt_floatset(0.0)
thegaussout = 0.0 * corr_y
theR2 = rt_floatset(0.0)
else:
volumetotalinc = 1
thetime = rt_floatset(np.fmod(maxlag, thefitter.lagmod))
thestrength = rt_floatset(maxval)
thesigma = rt_floatset(maxsigma)
thegaussout = rt_floatset(0.0 * corr_y)
thewindowout = rt_floatset(0.0 * corr_y)
if (not fixdelay) and (maxsigma != 0.0):
thegaussout = rt_floatset(tide_fit.gauss_eval(thefitter.corrtimeaxis, [maxval, maxlag, maxsigma]))
else:
thegaussout = rt_floatset(0.0)
thewindowout = rt_floatset(0.0)
theR2 = rt_floatset(thestrength * thestrength)
return vox, volumetotalinc, thelagtc, thetime, thestrength, thesigma, thegaussout, \
thewindowout, theR2, maskval, failreason
def autocorrcheck(corrscale, thexcorr, delta=0.1, acampthresh=0.1, aclagthresh=10.0, displayplots=False, prewindow=True,
detrendorder=1, debug=False):
"""
Parameters
----------
corrscale
thexcorr
delta
acampthresh
aclagthresh
displayplots
prewindow
detrendorder
debug
Returns
-------
"""
lookahead = 2
peaks = tide_fit.peakdetect(thexcorr, x_axis=corrscale, delta=delta, lookahead=lookahead)
maxpeaks = np.asarray(peaks[0], dtype='float64')
minpeaks = np.asarray(peaks[1], dtype='float64')
if len(peaks[0]) > 0:
if debug:
print(peaks)
zeropkindex = np.argmin(abs(maxpeaks[:, 0]))
for i in range(zeropkindex + 1, maxpeaks.shape[0]):
if maxpeaks[i, 0] > aclagthresh:
return None, None
if maxpeaks[i, 1] > acampthresh:
sidelobetime = maxpeaks[i, 0]
sidelobeindex = tide_util.valtoindex(corrscale, sidelobetime)
sidelobeamp = thexcorr[sidelobeindex]
numbins = 1
while (sidelobeindex + numbins < np.shape(corrscale)[0] - 1) and (
thexcorr[sidelobeindex + numbins] > sidelobeamp / 2.0):
numbins += 1
sidelobewidth = (corrscale[sidelobeindex + numbins] - corrscale[sidelobeindex]) * 2.0
fitstart = sidelobeindex - numbins
fitend = sidelobeindex + numbins
sidelobeamp, sidelobetime, sidelobewidth = tide_fit.gaussfit(sidelobeamp, sidelobetime, sidelobewidth,
corrscale[fitstart:fitend + 1],
thexcorr[fitstart:fitend + 1])
if displayplots:
pl.plot(corrscale[fitstart:fitend + 1], thexcorr[fitstart:fitend + 1], 'k',
corrscale[fitstart:fitend + 1],
tide_fit.gauss_eval(corrscale[fitstart:fitend + 1], [sidelobeamp, sidelobetime, sidelobewidth]),
'r')
pl.show()
return sidelobetime, sidelobeamp
return None, None
def _procOneVoxelFitcorrx(vox,
corrtc,
corrscale,
genlagtc,
initial_fmri_x,
optiondict,
zerooutbadfit=True,
displayplots=False,
initiallag=None,
rt_floatset=np.float64,
rt_floattype='float64'):
maxindex, maxlag, maxval, maxsigma, maskval, peakstart, peakend, failreason = onecorrfitx(corrtc,
corrscale,
optiondict,
zerooutbadfit=zerooutbadfit,
displayplots=displayplots,
initiallag=initiallag,
rt_floatset=rt_floatset,
rt_floattype=rt_floattype)
if maxval > 0.3:
displayplots = False
# question - should maxlag be added or subtracted? As of 10/18, it is subtracted
# potential answer - tried adding, results are terrible.
thelagtc = rt_floatset(genlagtc.yfromx(initial_fmri_x - maxlag))
# now tuck everything away in the appropriate output array
volumetotalinc = 0
thewindowout = rt_floatset(0.0 * corrtc)
thewindowout[peakstart:peakend + 1] = 1.0
if (maskval == 0) and optiondict['zerooutbadfit']:
thetime = rt_floatset(0.0)
thestrength = rt_floatset(0.0)
thesigma = rt_floatset(0.0)
thegaussout = 0.0 * corrtc
theR2 = rt_floatset(0.0)
else:
volumetotalinc = 1
thetime = rt_floatset(np.fmod(maxlag, optiondict['lagmod']))
thestrength = rt_floatset(maxval)
thesigma = rt_floatset(maxsigma)
thegaussout = rt_floatset(0.0 * corrtc)
thewindowout = rt_floatset(0.0 * corrtc)
if (not optiondict['fixdelay']) and (maxsigma != 0.0):
thegaussout = rt_floatset(tide_fit.gauss_eval(corrscale, [maxval, maxlag, maxsigma]))
else:
thegaussout = rt_floatset(0.0)
thewindowout = rt_floatset(0.0)
theR2 = rt_floatset(thestrength * thestrength)
return vox, volumetotalinc, thelagtc, thetime, thestrength, thesigma, thegaussout, \
thewindowout, theR2, maskval, failreason
def _procOneVoxelFitcorr(vox,
corr_y,
corr_x,
lagtcgenerator,
timeaxis,
optiondict,
zerooutbadfit=True,
displayplots=False,
initiallag=None,
rt_floatset=np.float64,
rt_floattype='float64'
):
maxindex, maxlag, maxval, maxsigma, maskval, failreason = onecorrfit(corr_y,
corr_x,
optiondict,
zerooutbadfit=zerooutbadfit,
displayplots=displayplots,
initiallag=initiallag,
rt_floatset=rt_floatset,
rt_floattype=rt_floattype)
if maxval > 0.3:
displayplots = False
# question - should maxlag be added or subtracted? As of 10/18, it is subtracted
# potential answer - tried adding, results are terrible.
thelagtc = rt_floatset(lagtcgenerator.yfromx(timeaxis - maxlag))
# now tuck everything away in the appropriate output array
volumetotalinc = 0
if (maskval == 0) and optiondict['zerooutbadfit']:
thetime = rt_floatset(0.0)
thestrength = rt_floatset(0.0)
thesigma = rt_floatset(0.0)
thegaussout = 0.0 * corr_y
theR2 = rt_floatset(0.0)
else:
volumetotalinc = 1
thetime = rt_floatset(np.fmod(maxlag, optiondict['lagmod']))
thestrength = rt_floatset(maxval)
thesigma = rt_floatset(maxsigma)
if (not optiondict['fixdelay']) and (maxsigma != 0.0):
thegaussout = rt_floatset(tide_fit.gauss_eval(corr_x, [maxval, maxlag, maxsigma]))
else:
thegaussout = rt_floatset(0.0)
theR2 = rt_floatset(thestrength * thestrength)
return vox, volumetotalinc, thelagtc, thetime, thestrength, thesigma, thegaussout, theR2, maskval, failreason
def congrid(xaxis, loc, val, width, kernel='kaiser', cyclic=True, debug=False):
"""
Perform a convolution gridding operation with a Kaiser-Bessel or Gaussian kernel of width 'width'
Parameters
----------
xaxis: array-like
The target axis for resampling
loc: float
The location, in x-axis units, of the sample to be gridded
val: float
The value to be gridded
width: float
The width of the gridding kernel in target bins
kernel: {'old', 'gauss', 'kaiser'}, optional
The type of convolution gridding kernel. Default is 'kaiser'.
debug: bool, optional
When True, output additional information about the gridding process
Returns
-------
vals: array-like
The input value, convolved with the gridding kernel, projected on to x axis points
weights: array-like
The values of convolution kernel, projected on to x axis points (used for normalization)
indices: array-like
The indices along the x axis where the vals and weights fall.
Notes
-----
See IEEE TRANSACTIONS ON MEDICAL IMAGING. VOL. IO.NO. 3, SEPTEMBER 1991
"""
global congridyvals
if (congridyvals['kernel'] != kernel) or (congridyvals['width'] != width):
if congridyvals['kernel'] != kernel:
print(congridyvals['kernel'], '!=', kernel)
if congridyvals['width'] != width:
print(congridyvals['width'],'!=', width)
print('(re)initializing congridyvals')
congridyvals = {}
congridyvals['kernel'] = kernel
congridyvals['width'] = width * 1.0
optsigma = np.array([0.4241, 0.4927, 0.4839, 0.5063, 0.5516, 0.5695, 0.5682, 0.5974])
optbeta = np.array([1.9980, 2.3934, 3.3800, 4.2054, 4.9107, 5.7567, 6.6291, 7.4302])
xstep = xaxis[1] - xaxis[0]
if (loc < xaxis[0] - xstep / 2.0 or loc > xaxis[-1] + xstep / 2.0) and not cyclic:
print('loc', loc, 'not in range', xaxis[0], xaxis[-1])
# choose the smoothing kernel based on the width
if kernel != 'old':
if not (1.5 <= width <= 5.0) or (np.fmod(width, 0.5) > 0.0):
print('congrid: width is', width)
print('congrid: width must be a half-integral value between 1.5 and 5.0 inclusive')
sys.exit()
else:
kernelindex = int((width - 1.5) // 0.5)
# find the closest grid point to the target location, calculate relative offsets from this point
center = tide_util.valtoindex(xaxis, loc)
offset = np.fmod(np.round((loc - xaxis[center]) / xstep, 3), 1.0) # will vary from -0.5 to 0.5
if cyclic:
if center == len(xaxis) - 1 and offset > 0.5:
center = 0
offset -= 1.0
if center == 0 and offset < -0.5:
center = len(xaxis) - 1
offset += 1.0
if not (-0.5 <= offset <= 0.5):
print('(loc, xstep, center, offset):', loc, xstep, center, offset)
print('xaxis:', xaxis)
sys.exit()
offsetkey = str(offset)
if kernel == 'old':
if debug:
print('gridding with old kernel')
widthinpts = int(np.round(width * 4.6 / xstep))
widthinpts -= widthinpts % 2 - 1
try:
yvals = congridyvals[offsetkey]
except KeyError:
if debug:
print('new key:', offsetkey)
xvals = np.linspace(-xstep * (widthinpts // 2), xstep * (widthinpts // 2), num=widthinpts,
endpoint=True) + offset
congridyvals[offsetkey] = tide_fit.gauss_eval(xvals, np.array([1.0, 0.0, width]))
yvals = congridyvals[offsetkey]
startpt = int(center - widthinpts // 2)
indices = range(startpt, startpt + widthinpts)
indices = np.remainder(indices, len(xaxis))
if debug:
print('center, offset, indices, yvals', center, offset, indices, yvals)
return val * yvals, yvals, indices
else:
offsetinpts = center + offset
startpt = int(np.ceil(offsetinpts - width / 2.0))
endpt = int(np.floor(offsetinpts + width / 2.0))
indices = np.remainder(range(startpt, endpt + 1), len(xaxis))
try:
yvals = congridyvals[offsetkey]
except KeyError:
if debug:
print('new key:', offsetkey)
xvals = indices - center + offset
if kernel == 'gauss':
sigma = optsigma[kernelindex]
congridyvals[offsetkey] = tide_fit.gauss_eval(xvals, np.array([1.0, 0.0, sigma]))
elif kernel == 'kaiser':
beta = optbeta[kernelindex]
congridyvals[offsetkey] = tide_fit.kaiserbessel_eval(xvals, np.array([beta, width / 2.0]))
else:
print('illegal kernel value in congrid - exiting')
sys.exit()
yvals = congridyvals[offsetkey]
if debug:
print('xvals, yvals', xvals, yvals)
if debug:
print('center, offset, indices, yvals', center, offset, indices, yvals)
return val * yvals, yvals, indices
def autocorrcheck(corrscale,
thexcorr,
delta=0.1,
acampthresh=0.1,
aclagthresh=10.0,
displayplots=False,
prewindow=True,
detrendorder=1,
debug=False):
"""
Parameters
----------
corrscale
thexcorr
delta
acampthresh
aclagthresh
displayplots
prewindow
detrendorder
debug
Returns
-------
"""
lookahead = 2
peaks = tide_fit.peakdetect(thexcorr,
x_axis=corrscale,
delta=delta,
lookahead=lookahead)
maxpeaks = np.asarray(peaks[0], dtype='float64')
minpeaks = np.asarray(peaks[1], dtype='float64')
if len(peaks[0]) > 0:
if debug:
print(peaks)
zeropkindex = np.argmin(abs(maxpeaks[:, 0]))
for i in range(zeropkindex + 1, maxpeaks.shape[0]):
if maxpeaks[i, 0] > aclagthresh:
return None, None
if maxpeaks[i, 1] > acampthresh:
sidelobetime = maxpeaks[i, 0]
sidelobeindex = tide_util.valtoindex(corrscale, sidelobetime)
sidelobeamp = thexcorr[sidelobeindex]
numbins = 1
while (sidelobeindex + numbins < np.shape(corrscale)[0] -
1) and (thexcorr[sidelobeindex + numbins] >
sidelobeamp / 2.0):
numbins += 1
sidelobewidth = (corrscale[sidelobeindex + numbins] -
corrscale[sidelobeindex]) * 2.0
fitstart = sidelobeindex - numbins
fitend = sidelobeindex + numbins
sidelobeamp, sidelobetime, sidelobewidth = tide_fit.gaussfit(
sidelobeamp, sidelobetime, sidelobewidth,
corrscale[fitstart:fitend + 1],
thexcorr[fitstart:fitend + 1])
if displayplots:
pl.plot(
corrscale[fitstart:fitend + 1],
thexcorr[fitstart:fitend + 1], 'k',
corrscale[fitstart:fitend + 1],
tide_fit.gauss_eval(
corrscale[fitstart:fitend + 1],
[sidelobeamp, sidelobetime, sidelobewidth]), 'r')
pl.show()
return sidelobetime, sidelobeamp
return None, None
def fit(self, incorrfunc):
# check to make sure xcorr_x and xcorr_y match
if self.corrtimeaxis is None:
print("Correlation time axis is not defined - exiting")
sys.exit()
if len(self.corrtimeaxis) != len(incorrfunc):
print(
"Correlation time axis and values do not match in length (",
len(self.corrtimeaxis),
"!=",
len(incorrfunc),
"- exiting",
)
sys.exit()
# set initial parameters
# absmaxsigma is in seconds
# maxsigma is in Hz
# maxlag is in seconds
warnings.filterwarnings("ignore", "Number*")
failreason = self.FML_NOERROR
maskval = np.uint16(1) # start out assuming the fit will succeed
binwidth = self.corrtimeaxis[1] - self.corrtimeaxis[0]
# set the search range
lowerlim = 0
upperlim = len(self.corrtimeaxis) - 1
if self.debug:
print(
"initial search indices are",
lowerlim,
"to",
upperlim,
"(",
self.corrtimeaxis[lowerlim],
self.corrtimeaxis[upperlim],
")",
)
# make an initial guess at the fit parameters for the gaussian
# start with finding the maximum value and its location
flipfac = 1.0
corrfunc = incorrfunc + 0.0
if self.useguess:
maxindex = tide_util.valtoindex(self.corrtimeaxis, self.maxguess)
if corrfunc[maxindex] < 0.0:
flipfac = -1.0
else:
maxindex, flipfac = self._maxindex_noedge(corrfunc)
corrfunc *= flipfac
maxlag_init = (1.0 * self.corrtimeaxis[maxindex]).astype("float64")
maxval_init = corrfunc[maxindex].astype("float64")
if self.debug:
print(
"maxindex, maxlag_init, maxval_init:",
maxindex,
maxlag_init,
maxval_init,
)
# set the baseline and baselinedev levels
if (self.functype == "correlation") or (self.functype == "hybrid"):
baseline = 0.0
baselinedev = 0.0
else:
# for mutual information, there is a nonzero baseline, so we want the difference from that.
baseline = np.median(corrfunc)
baselinedev = mad(corrfunc)
if self.debug:
print("baseline, baselinedev:", baseline, baselinedev)
# then calculate the width of the peak
if self.peakfittype == "fastquad" or self.peakfittype == "COM":
peakstart = np.max([1, maxindex - 2])
peakend = np.min([len(self.corrtimeaxis) - 2, maxindex + 2])
else:
thegrad = np.gradient(corrfunc).astype(
"float64") # the gradient of the correlation function
if (self.functype == "correlation") or (self.functype == "hybrid"):
if self.peakfittype == "quad":
peakpoints = np.where(
corrfunc > maxval_init - 0.05, 1, 0
) # mask for places where correlation exceeds searchfrac*maxval_init
else:
peakpoints = np.where(
corrfunc > self.searchfrac * maxval_init, 1, 0
) # mask for places where correlation exceeds searchfrac*maxval_init
else:
# for mutual information, there is a flattish, nonzero baseline, so we want the difference from that.
peakpoints = np.where(
corrfunc >
(baseline + self.searchfrac * (maxval_init - baseline)),
1,
0,
)
peakpoints[0] = 0
peakpoints[-1] = 0
peakstart = np.max([1, maxindex - 1])
peakend = np.min([len(self.corrtimeaxis) - 2, maxindex + 1])
if self.debug:
print("initial peakstart, peakend:", peakstart, peakend)
if self.functype == "mutualinfo":
while peakpoints[peakend + 1] == 1:
peakend += 1
while peakpoints[peakstart - 1] == 1:
peakstart -= 1
else:
while thegrad[peakend + 1] <= 0.0 and peakpoints[peakend +
1] == 1:
peakend += 1
while thegrad[peakstart - 1] >= 0.0 and peakpoints[peakstart -
1] == 1:
peakstart -= 1
if self.debug:
print("final peakstart, peakend:", peakstart, peakend)
# deal with flat peak top
while (peakend < (len(self.corrtimeaxis) - 3)
and corrfunc[peakend] == corrfunc[peakend - 1]):
peakend += 1
while peakstart > 2 and corrfunc[peakstart] == corrfunc[peakstart +
1]:
peakstart -= 1
if self.debug:
print("peakstart, peakend after flattop correction:",
peakstart, peakend)
print("\n")
for i in range(peakstart, peakend + 1):
print(self.corrtimeaxis[i], corrfunc[i])
print("\n")
fig = plt.figure()
ax = fig.add_subplot(111)
ax.set_title("Peak sent to fitting routine")
plt.plot(
self.corrtimeaxis[peakstart:peakend + 1],
corrfunc[peakstart:peakend + 1],
"r",
)
plt.show()
# This is calculated from first principles, but it's always big by a factor or ~1.4.
# Which makes me think I dropped a factor if sqrt(2). So fix that with a final division
maxsigma_init = np.float64(
((peakend - peakstart + 1) * binwidth /
(2.0 * np.sqrt(-np.log(self.searchfrac)))) / np.sqrt(2.0))
if self.debug:
print("maxsigma_init:", maxsigma_init)
# now check the values for errors
if self.hardlimit:
rangeextension = 0.0
else:
rangeextension = (self.lagmax - self.lagmin) * 0.75
if not ((self.lagmin - rangeextension - binwidth) <= maxlag_init <=
(self.lagmax + rangeextension + binwidth)):
if maxlag_init <= (self.lagmin - rangeextension - binwidth):
failreason |= self.FML_INITLAGLOW
maxlag_init = self.lagmin - rangeextension - binwidth
else:
failreason |= self.FML_INITLAGHIGH
maxlag_init = self.lagmax + rangeextension + binwidth
if self.debug:
print("bad initial")
if maxsigma_init > self.absmaxsigma:
failreason |= self.FML_INITWIDTHHIGH
maxsigma_init = self.absmaxsigma
if self.debug:
print("bad initial width - too high")
if peakend - peakstart < 2:
failreason |= self.FML_INITWIDTHLOW
maxsigma_init = np.float64(
((2 + 1) * binwidth /
(2.0 * np.sqrt(-np.log(self.searchfrac)))) / np.sqrt(2.0))
if self.debug:
print("bad initial width - too low")
if (self.functype == "correlation") or (self.functype == "hybrid"):
if not (self.lthreshval <= maxval_init <=
self.uthreshval) and self.enforcethresh:
failreason |= self.FML_INITAMPLOW
if self.debug:
print(
"bad initial amp:",
maxval_init,
"is less than",
self.lthreshval,
)
if maxval_init < 0.0:
failreason |= self.FML_INITAMPLOW
maxval_init = 0.0
if self.debug:
print("bad initial amp:", maxval_init,
"is less than 0.0")
if maxval_init > 1.0:
failreason |= self.FML_INITAMPHIGH
maxval_init = 1.0
if self.debug:
print("bad initial amp:", maxval_init,
"is greater than 1.0")
else:
# somewhat different rules for mutual information peaks
if ((maxval_init - baseline) < self.lthreshval *
baselinedev) or (maxval_init < baseline):
failreason |= self.FML_INITAMPLOW
maxval_init = 0.0
if self.debug:
print("bad initial amp:", maxval_init,
"is less than 0.0")
if (failreason != self.FML_NOERROR) and self.zerooutbadfit:
maxval = np.float64(0.0)
maxlag = np.float64(0.0)
maxsigma = np.float64(0.0)
else:
maxval = np.float64(maxval_init)
maxlag = np.float64(maxlag_init)
maxsigma = np.float64(maxsigma_init)
# refine if necessary
if self.peakfittype != "None":
if self.peakfittype == "COM":
X = self.corrtimeaxis[peakstart:peakend + 1] - baseline
data = corrfunc[peakstart:peakend + 1]
maxval = maxval_init
maxlag = np.sum(X * data) / np.sum(data)
maxsigma = 10.0
elif self.peakfittype == "gauss":
X = self.corrtimeaxis[peakstart:peakend + 1] - baseline
data = corrfunc[peakstart:peakend + 1]
# do a least squares fit over the top of the peak
# p0 = np.array([maxval_init, np.fmod(maxlag_init, lagmod), maxsigma_init], dtype='float64')
p0 = np.array([maxval_init, maxlag_init, maxsigma_init],
dtype="float64")
if self.debug:
print("fit input array:", p0)
try:
plsq, dummy = sp.optimize.leastsq(tide_fit.gaussresiduals,
p0,
args=(data, X),
maxfev=5000)
maxval = plsq[0] + baseline
maxlag = np.fmod((1.0 * plsq[1]), self.lagmod)
maxsigma = plsq[2]
except:
maxval = np.float64(0.0)
maxlag = np.float64(0.0)
maxsigma = np.float64(0.0)
if self.debug:
print("fit output array:", [maxval, maxlag, maxsigma])
elif self.peakfittype == "fastgauss":
X = self.corrtimeaxis[peakstart:peakend + 1] - baseline
data = corrfunc[peakstart:peakend + 1]
# do a non-iterative fit over the top of the peak
# 6/12/2015 This is just broken. Gives quantized maxima
maxlag = np.float64(1.0 * np.sum(X * data) / np.sum(data))
maxsigma = np.float64(
np.sqrt(
np.abs(np.sum((X - maxlag)**2 * data) / np.sum(data))))
maxval = np.float64(data.max()) + baseline
elif self.peakfittype == "fastquad":
maxlag, maxval, maxsigma, ismax, badfit = tide_fit.refinepeak_quad(
self.corrtimeaxis, corrfunc, maxindex)
elif self.peakfittype == "quad":
X = self.corrtimeaxis[peakstart:peakend + 1]
data = corrfunc[peakstart:peakend + 1]
try:
thecoffs = np.polyfit(X, data, 2)
a = thecoffs[0]
b = thecoffs[1]
c = thecoffs[2]
maxlag = -b / (2.0 * a)
maxval = a * maxlag * maxlag + b * maxlag + c
maxsigma = 1.0 / np.fabs(a)
if self.debug:
print("poly coffs:", a, b, c)
print("maxlag, maxval, maxsigma:", maxlag, maxval,
maxsigma)
except np.lib.polynomial.RankWarning:
maxlag = 0.0
maxval = 0.0
maxsigma = 0.0
if self.debug:
print("\n")
for i in range(len(X)):
print(X[i], data[i])
print("\n")
fig = plt.figure()
ax = fig.add_subplot(111)
ax.set_title("Peak and fit")
plt.plot(X, data, "r")
plt.plot(X, c + b * X + a * X * X, "b")
plt.show()
else:
print("illegal peak refinement type")
# check for errors in fit
fitfail = False
if self.bipolar:
lowestcorrcoeff = -1.0
else:
lowestcorrcoeff = 0.0
if (self.functype == "correlation") or (self.functype == "hybrid"):
if maxval < lowestcorrcoeff:
failreason |= self.FML_FITAMPLOW
maxval = lowestcorrcoeff
if self.debug:
print("bad fit amp: maxval is lower than lower limit")
fitfail = True
if np.abs(maxval) > 1.0:
if not self.allowhighfitamps:
failreason |= self.FML_FITAMPHIGH
if self.debug:
print(
"bad fit amp: magnitude of",
maxval,
"is greater than 1.0",
)
fitfail = True
maxval = 1.0 * np.sign(maxval)
else:
# different rules for mutual information peaks
if ((maxval - baseline) <
self.lthreshval * baselinedev) or (maxval < baseline):
failreason |= self.FML_FITAMPLOW
if self.debug:
if (maxval - baseline) < self.lthreshval * baselinedev:
print(
"FITAMPLOW: maxval - baseline:",
maxval - baseline,
" < lthreshval * baselinedev:",
self.lthreshval * baselinedev,
)
if maxval < baseline:
print("FITAMPLOW: maxval < baseline:", maxval,
baseline)
maxval_init = 0.0
if self.debug:
print("bad fit amp: maxval is lower than lower limit")
if (self.lagmin > maxlag) or (maxlag > self.lagmax):
if self.debug:
print("bad lag after refinement")
if self.lagmin > maxlag:
failreason |= self.FML_FITLAGLOW
maxlag = self.lagmin
else:
failreason |= self.FML_FITLAGHIGH
maxlag = self.lagmax
fitfail = True
if maxsigma > self.absmaxsigma:
failreason |= self.FML_FITWIDTHHIGH
if self.debug:
print("bad width after refinement:", maxsigma, ">",
self.absmaxsigma)
maxsigma = self.absmaxsigma
fitfail = True
if maxsigma < self.absminsigma:
failreason |= self.FML_FITWIDTHLOW
if self.debug:
print("bad width after refinement:", maxsigma, "<",
self.absminsigma)
maxsigma = self.absminsigma
fitfail = True
if fitfail:
if self.debug:
print("fit fail")
if self.zerooutbadfit:
maxval = np.float64(0.0)
maxlag = np.float64(0.0)
maxsigma = np.float64(0.0)
maskval = np.uint16(0)
# print(maxlag_init, maxlag, maxval_init, maxval, maxsigma_init, maxsigma, maskval, failreason, fitfail)
else:
maxval = np.float64(maxval_init)
maxlag = np.float64(np.fmod(maxlag_init, self.lagmod))
maxsigma = np.float64(maxsigma_init)
if failreason != self.FML_NOERROR:
maskval = np.uint16(0)
if self.debug or self.displayplots:
print(
"init to final: maxval",
maxval_init,
maxval,
", maxlag:",
maxlag_init,
maxlag,
", width:",
maxsigma_init,
maxsigma,
)
if self.displayplots and (self.peakfittype != "None") and (maskval !=
0.0):
fig = plt.figure()
ax = fig.add_subplot(111)
ax.set_title("Data and fit")
hiresx = np.arange(X[0], X[-1], (X[1] - X[0]) / 10.0)
plt.plot(
X,
data,
"ro",
hiresx,
tide_fit.gauss_eval(hiresx,
np.array([maxval, maxlag, maxsigma])),
"b-",
)
plt.show()
return (
maxindex,
maxlag,
flipfac * maxval,
maxsigma,
maskval,
failreason,
peakstart,
peakend,
)
def check_autocorrelation(
corrscale,
thexcorr,
delta=0.1,
acampthresh=0.1,
aclagthresh=10.0,
displayplots=False,
detrendorder=1,
):
"""Check for autocorrelation in an array.
Parameters
----------
corrscale
thexcorr
delta
acampthresh
aclagthresh
displayplots
windowfunc
detrendorder
Returns
-------
sidelobetime
sidelobeamp
"""
lookahead = 2
peaks = tide_fit.peakdetect(thexcorr, x_axis=corrscale, delta=delta, lookahead=lookahead)
maxpeaks = np.asarray(peaks[0], dtype="float64")
if len(peaks[0]) > 0:
LGR.debug(peaks)
zeropkindex = np.argmin(abs(maxpeaks[:, 0]))
for i in range(zeropkindex + 1, maxpeaks.shape[0]):
if maxpeaks[i, 0] > aclagthresh:
return None, None
if maxpeaks[i, 1] > acampthresh:
sidelobetime = maxpeaks[i, 0]
sidelobeindex = tide_util.valtoindex(corrscale, sidelobetime)
sidelobeamp = thexcorr[sidelobeindex]
numbins = 1
while (sidelobeindex + numbins < np.shape(corrscale)[0] - 1) and (
thexcorr[sidelobeindex + numbins] > sidelobeamp / 2.0
):
numbins += 1
sidelobewidth = (
corrscale[sidelobeindex + numbins] - corrscale[sidelobeindex]
) * 2.0
fitstart = sidelobeindex - numbins
fitend = sidelobeindex + numbins
sidelobeamp, sidelobetime, sidelobewidth = tide_fit.gaussfit(
sidelobeamp,
sidelobetime,
sidelobewidth,
corrscale[fitstart : fitend + 1],
thexcorr[fitstart : fitend + 1],
)
if displayplots:
plt.plot(
corrscale[fitstart : fitend + 1],
thexcorr[fitstart : fitend + 1],
"k",
corrscale[fitstart : fitend + 1],
tide_fit.gauss_eval(
corrscale[fitstart : fitend + 1],
[sidelobeamp, sidelobetime, sidelobewidth],
),
"r",
)
plt.show()
return sidelobetime, sidelobeamp
return None, None
def test_findmaxlag(display=False, debug=False):
textfilename = op.join(get_test_data_path(), 'lt_rt.txt')
display = False
debug = False
# set default variable values
searchfrac = 0.75
limitfit = False
indata = tide_io.readvecs(textfilename)
xvecs = indata[0, :]
yvecs = indata[1, :]
testmaxval = 0.8
testmaxlag = 8.0
testmaxsigma = 5.0
yvecs = tide_fit.gauss_eval(xvecs, np.array([testmaxval, testmaxlag,
testmaxsigma]))
lagmin = -20
lagmax = 20
widthlimit = 1000.0
absmaxsigma = 1000.0
(maxindex, maxlag, maxval, maxsigma, maskval,
failreason, peakstart, peakend) = tide_fit.findmaxlag_gauss(
xvecs,
yvecs,
lagmin, lagmax, widthlimit,
tweaklims=False,
refine=True,
debug=debug,
searchfrac=searchfrac,
zerooutbadfit=False)
(maxindexr, maxlagr, maxvalr, maxsigmar, maskvalr,
failreasonr, peakstartr, peakendr) = tide_fit.findmaxlag_gauss_rev(
xvecs,
yvecs,
lagmin, lagmax, widthlimit,
absmaxsigma=absmaxsigma,
tweaklims=False,
refine=True,
debug=debug,
searchfrac=searchfrac,
zerooutbadfit=False)
print('final results:', maxindex, maxlag, maxval, maxsigma, maskval,
failreason, peakstart, peakend)
print('final results:', maxindexr, maxlagr, maxvalr, maxsigmar, maskvalr,
failreasonr, peakstartr, peakendr)
oversampfactor = 10
gauss_xvecs = arange(xvecs[0], xvecs[-1],
(xvecs[1]-xvecs[0]) / oversampfactor, dtype='float')
gauss_yvecs = tide_fit.gauss_eval(gauss_xvecs, (maxval, maxlag, maxsigma))
gauss_yvecsr = tide_fit.gauss_eval(gauss_xvecs, (maxvalr, maxlagr,
maxsigmar))
if display:
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.plot(xvecs,yvecs,'r')
ax.plot(gauss_xvecs[(peakstart*oversampfactor):(peakend*oversampfactor+1)], 0.1 + gauss_yvecs[(peakstart*oversampfactor):(peakend*oversampfactor+1)],'g.')
ax.plot(gauss_xvecs[(peakstartr*oversampfactor):(peakendr*oversampfactor+1)], 0.2 + gauss_yvecsr[(peakstartr*oversampfactor):(peakendr*oversampfactor+1)],'b.')
#ax.set_xlim((lagmin, lagmax))
plt.show()
def congrid(xaxis, loc, val, width, kernel="kaiser", cyclic=True, debug=False):
"""
Perform a convolution gridding operation with a Kaiser-Bessel or Gaussian kernel of width 'width'. Grid
parameters are cached for performance.
Parameters
----------
xaxis: array-like
The target axis for resampling
loc: float
The location, in x-axis units, of the sample to be gridded
val: float
The value to be gridded
width: float
The width of the gridding kernel in target bins
kernel: {'old', 'gauss', 'kaiser'}, optional
The type of convolution gridding kernel. Default is 'kaiser'.
cyclic: bool, optional
When True, gridding wraps around the endpoints of xaxis. Default is True.
debug: bool, optional
When True, output additional information about the gridding process
Returns
-------
vals: array-like
The input value, convolved with the gridding kernel, projected on to x axis points
weights: array-like
The values of convolution kernel, projected on to x axis points (used for normalization)
indices: array-like
The indices along the x axis where the vals and weights fall.
Notes
-----
See IEEE TRANSACTIONS ON MEDICAL IMAGING. VOL. IO.NO. 3, SEPTEMBER 1991
"""
global congridyvals
if (congridyvals["kernel"] != kernel) or (congridyvals["width"] != width):
if congridyvals["kernel"] != kernel:
if debug:
print(congridyvals["kernel"], "!=", kernel)
if congridyvals["width"] != width:
if debug:
print(congridyvals["width"], "!=", width)
if debug:
print("(re)initializing congridyvals")
congridyvals = {}
congridyvals["kernel"] = kernel
congridyvals["width"] = width * 1.0
optsigma = np.array([0.4241, 0.4927, 0.4839, 0.5063, 0.5516, 0.5695, 0.5682, 0.5974])
optbeta = np.array([1.9980, 2.3934, 3.3800, 4.2054, 4.9107, 5.7567, 6.6291, 7.4302])
xstep = xaxis[1] - xaxis[0]
if (loc < xaxis[0] - xstep / 2.0 or loc > xaxis[-1] + xstep / 2.0) and not cyclic:
print("loc", loc, "not in range", xaxis[0], xaxis[-1])
# choose the smoothing kernel based on the width
if kernel != "old":
if not (1.5 <= width <= 5.0) or (np.fmod(width, 0.5) > 0.0):
print("congrid: width is", width)
print("congrid: width must be a half-integral value between 1.5 and 5.0 inclusive")
sys.exit()
else:
kernelindex = int((width - 1.5) // 0.5)
# find the closest grid point to the target location, calculate relative offsets from this point
center = tide_util.valtoindex(xaxis, loc)
offset = np.fmod(np.round((loc - xaxis[center]) / xstep, 3), 1.0) # will vary from -0.5 to 0.5
if cyclic:
if center == len(xaxis) - 1 and offset > 0.5:
center = 0
offset -= 1.0
if center == 0 and offset < -0.5:
center = len(xaxis) - 1
offset += 1.0
if not (-0.5 <= offset <= 0.5):
print("(loc, xstep, center, offset):", loc, xstep, center, offset)
print("xaxis:", xaxis)
sys.exit()
offsetkey = str(offset)
if kernel == "old":
if debug:
print("gridding with old kernel")
widthinpts = int(np.round(width * 4.6 / xstep))
widthinpts -= widthinpts % 2 - 1
try:
yvals = congridyvals[offsetkey]
except KeyError:
if debug:
print("new key:", offsetkey)
xvals = (
np.linspace(
-xstep * (widthinpts // 2),
xstep * (widthinpts // 2),
num=widthinpts,
endpoint=True,
)
+ offset
)
congridyvals[offsetkey] = tide_fit.gauss_eval(xvals, np.array([1.0, 0.0, width]))
yvals = congridyvals[offsetkey]
startpt = int(center - widthinpts // 2)
indices = range(startpt, startpt + widthinpts)
indices = np.remainder(indices, len(xaxis))
if debug:
print("center, offset, indices, yvals", center, offset, indices, yvals)
return val * yvals, yvals, indices
else:
offsetinpts = center + offset
startpt = int(np.ceil(offsetinpts - width / 2.0))
endpt = int(np.floor(offsetinpts + width / 2.0))
indices = np.remainder(range(startpt, endpt + 1), len(xaxis))
try:
yvals = congridyvals[offsetkey]
except KeyError:
if debug:
print("new key:", offsetkey)
xvals = indices - center + offset
if kernel == "gauss":
sigma = optsigma[kernelindex]
congridyvals[offsetkey] = tide_fit.gauss_eval(xvals, np.array([1.0, 0.0, sigma]))
elif kernel == "kaiser":
beta = optbeta[kernelindex]
congridyvals[offsetkey] = tide_fit.kaiserbessel_eval(
xvals, np.array([beta, width / 2.0])
)
else:
print("illegal kernel value in congrid - exiting")
sys.exit()
yvals = congridyvals[offsetkey]
if debug:
print("xvals, yvals", xvals, yvals)
if debug:
print("center, offset, indices, yvals", center, offset, indices, yvals)
return val * yvals, yvals, indices
def test_findmaxlag(display=False, fittype="gauss", debug=False):
textfilename = op.join(get_examples_path(), "lt_rt.txt")
# set default variable values
searchfrac = 0.75
indata = tide_io.readvecs(textfilename, debug=debug)
xvecs = indata[0, :]
yvecs = indata[1, :]
# set some fit parameters
lagmin = -20.0
lagmax = 20.0
widthlimit = 1000.0
absmaxsigma = 1000.0
absminsigma = 0.1
absmaxval = 1.0
absminval = 0.0
# test over the lag range
testmaxval = 0.8
testmaxsigma = 5.0
testlags = np.linspace(-25.0, 25.0, 50, endpoint=True)
testsigmas = np.full((len(testlags)), testmaxsigma, dtype=np.float64)
testvals = np.full((len(testlags)), testmaxval, dtype=np.float64)
fml_maxlags = np.zeros(len(testlags), dtype=np.float64)
fml_maxsigmas = np.zeros(len(testlags), dtype=np.float64)
fml_maxvals = np.zeros(len(testlags), dtype=np.float64)
fml_lfailreasons = np.zeros(len(testlags), dtype=np.uint16)
fmlc_maxlags = np.zeros(len(testlags), dtype=np.float64)
fmlc_maxsigmas = np.zeros(len(testlags), dtype=np.float64)
fmlc_maxvals = np.zeros(len(testlags), dtype=np.float64)
fmlc_lfailreasons = np.zeros(len(testlags), dtype=np.uint16)
# initialize the correlation fitter
thefitter = tide_classes.SimilarityFunctionFitter(
corrtimeaxis=xvecs,
lagmin=lagmin,
lagmax=lagmax,
absmaxsigma=absmaxsigma,
absminsigma=absminsigma,
peakfittype=fittype,
debug=debug,
searchfrac=searchfrac,
zerooutbadfit=False,
)
for i in range(len(testlags)):
yvecs = tide_fit.gauss_eval(
xvecs, np.array([testvals[i], testlags[i], testsigmas[i]]))
print()
print()
print()
(
maxindex,
fml_maxlags[i],
fml_maxvals[i],
fml_maxsigmas[i],
maskval,
fml_lfailreasons[i],
peakstart,
peakend,
) = tide_fit.findmaxlag_gauss(
xvecs,
yvecs,
lagmin,
lagmax,
widthlimit,
tweaklims=False,
refine=True,
debug=debug,
searchfrac=searchfrac,
absmaxsigma=absmaxsigma,
absminsigma=absminsigma,
zerooutbadfit=False,
)
print()
print()
print()
(
maxindexc,
fmlc_maxlags[i],
fmlc_maxvals[i],
fmlc_maxsigmas[i],
maskvalc,
fmlc_lfailreasons[i],
peakstartc,
peakendc,
) = thefitter.fit(yvecs)
print(
maxindexc,
fmlc_maxlags[i],
fmlc_maxvals[i],
fmlc_maxsigmas[i],
maskvalc,
fmlc_lfailreasons[i],
peakstartc,
peakendc,
)
if debug:
print("findmaxlag_gauss results over lag range")
for i in range(len(testlags)):
print(testlags[i], fml_maxlags[i], fml_lfailreasons[i])
assert eval_fml_result(lagmin, lagmax, testlags, fml_maxlags,
fml_lfailreasons)
assert eval_fml_result(absminval, absmaxval, testvals, fml_maxvals,
fml_lfailreasons)
assert eval_fml_result(absminsigma, absmaxsigma, testsigmas, fml_maxsigmas,
fml_lfailreasons)
assert eval_fml_result(lagmin, lagmax, testlags, fmlc_maxlags,
fmlc_lfailreasons)
assert eval_fml_result(absminval, absmaxval, testvals, fmlc_maxvals,
fmlc_lfailreasons)
assert eval_fml_result(absminsigma, absmaxsigma, testsigmas,
fmlc_maxsigmas, fmlc_lfailreasons)
if display:
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.plot(testlags, fml_maxlags, "r")
ax.plot(testlags, fmlc_maxlags, "b")
ax.legend(["findmaxlag_gauss", "classes"])
plt.show()
# now test over range of sigmas
testlag = 5.0
testsigmas = np.asarray([
0.01,
0.02,
0.05,
0.1,
0.2,
0.5,
1.0,
2.0,
5.0,
10.0,
20.0,
50.0,
100.0,
200.0,
500.0,
1000.0,
2000.0,
])
testlags = np.full((len(testsigmas)), testlag, dtype=np.float64)
testvals = np.full((len(testsigmas)), testmaxval, dtype=np.float64)
fml_maxlags = np.zeros(len(testsigmas), dtype=np.float64)
fml_maxsigmas = np.zeros(len(testsigmas), dtype=np.float64)
fml_maxvals = np.zeros(len(testsigmas), dtype=np.float64)
fml_wfailreasons = np.zeros(len(testsigmas), dtype=np.uint16)
fmlc_maxlags = np.zeros(len(testsigmas), dtype=np.float64)
fmlc_maxsigmas = np.zeros(len(testsigmas), dtype=np.float64)
fmlc_maxvals = np.zeros(len(testsigmas), dtype=np.float64)
fmlc_wfailreasons = np.zeros(len(testsigmas), dtype=np.uint16)
peakstartc = np.zeros(len(testsigmas), dtype=np.int32)
peakendc = np.zeros(len(testsigmas), dtype=np.int32)
for i in range(len(testsigmas)):
yvecs = tide_fit.gauss_eval(
xvecs, np.array([testvals[i], testlags[i], testsigmas[i]]))
print()
print()
print()
(
maxindex,
fml_maxlags[i],
fml_maxvals[i],
fml_maxsigmas[i],
maskval,
fml_wfailreasons[i],
peakstart,
peakend,
) = tide_fit.findmaxlag_gauss(
xvecs,
yvecs,
lagmin,
lagmax,
widthlimit,
tweaklims=False,
refine=True,
debug=debug,
searchfrac=searchfrac,
absmaxsigma=absmaxsigma,
absminsigma=absminsigma,
zerooutbadfit=False,
)
print()
print()
print()
(
maxindexc,
fmlc_maxlags[i],
fmlc_maxvals[i],
fmlc_maxsigmas[i],
maskvalc,
fmlc_wfailreasons[i],
peakstartc[i],
peakendc[i],
) = thefitter.fit(yvecs)
print(
maxindexc,
fmlc_maxlags[i],
fmlc_maxvals[i],
fmlc_maxsigmas[i],
maskvalc,
fmlc_wfailreasons[i],
peakstartc[i],
peakendc[i],
)
if debug:
print("findmaxlag_gauss results over sigma range")
for i in range(len(testsigmas)):
print(
testsigmas[i],
fml_maxsigmas[i],
fmlc_maxlags[i],
fmlc_maxvals[i],
fml_wfailreasons[i],
)
print("\nfitter class results over lag range")
for i in range(len(testsigmas)):
print(
testsigmas[i],
fmlc_maxsigmas[i],
fmlc_maxlags[i],
fmlc_maxvals[i],
peakstartc[i],
peakendc[i],
fmlc_wfailreasons[i],
thefitter.diagnosefail(np.uint32(fmlc_wfailreasons[i])),
)
if display:
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.loglog(testsigmas, fml_maxsigmas, "r")
ax.loglog(testsigmas, fmlc_maxsigmas, "b")
ax.legend(["findmaxlag_gauss", "classes"])
plt.show()
assert eval_fml_result(lagmin, lagmax, testlags, fml_maxlags,
fml_wfailreasons)
# assert eval_fml_result(absminval, absmaxval, testvals, fml_maxvals, fml_wfailreasons)
assert eval_fml_result(absminsigma, absmaxsigma, testsigmas, fml_maxsigmas,
fml_wfailreasons)
assert eval_fml_result(lagmin, lagmax, testlags, fmlc_maxlags,
fmlc_wfailreasons)
assert eval_fml_result(absminval, absmaxval, testvals, fmlc_maxvals,
fmlc_wfailreasons)
assert eval_fml_result(absminsigma, absmaxsigma, testsigmas,
fmlc_maxsigmas, fmlc_wfailreasons)