def w_frequencies(state, spacing):
"""
This function calculates the FFT frequencies
"""
nX = state.shape[0]
nY = state.shape[1]
return sp.meshgrid(2.0 * sp.pi * pl.fftfreq(nX, spacing), 2.0 * sp.pi * pl.fftfreq(nY, spacing))
def PhaseSpectPlotter(self, f, f2, wg, Res, comp, reg, TIM, out_name = None, frmt='png'):
Nx, Ny, Lx, Ly, N_nodes = self.OptsExtr()
ndav, int_step, cc = self.more_opts_extr()
actual_time = int(TIM)*int_step/ndav
Fmin, Fmax, res, res_x, res_y, clrmap, freq_min, freq_max,freq2_min, freq2_max = Res
# freq_min,freq_max = float(freq_min), float(freq_max)
absc_min, absc_max, ord_min, ord_max, absc_name, ord_name = comp
try:
if len(res.split('x'))>1:
resX = int(res.split('x')[0])
resY = int(res.split('x')[1])
else:
resX = int(res)
resY = resX
except ValueError:
self.stat_print("something's wrong with resolution")
if absc_name == 'y' and absc_max==0. and absc_min==0.:
L_absc = 0.
R_absc=Ly
elif absc_name == 'x' and absc_max==0. and absc_min==0.:
L_absc = 0.
R_absc=Lx
else:
R_absc=absc_max
L_absc=absc_min
if ord_name == 'y' and ord_max==0. and ord_min == 0.:
L_ord = 0.
R_ord=Ly
elif ord_name == 'x' and ord_max==0. and ord_min == 0.:
L_ord = 0.
R_ord=Lx
else:
R_ord=ord_max
L_ord=ord_min
a,b,c = np.histogram2d(f2, f, bins= ( resY, resX ), range=[[L_ord, R_ord],[L_absc, R_absc]],normed=False, weights = resX*resY*wg)
if Fmin == 0.:
Fmin = None
if Fmax == 0.:
Fmax= None
aa = abs(fft2(a))[:len(b)/2,:len(c)/2]
freqX = fftfreq(len(c),c[1]-c[0])[:len(c)/2]
freqY = fftfreq(len(b),b[1]-b[0])[:len(b)/2]
self.fig.clear()
sp = self.fig.add_subplot(111, title='time step = '+str(actual_time)+r'$ \tau_0$')
pplt = sp.imshow(aa,vmin=Fmin,vmax=Fmax,extent=[freqX[0],freqX[-1],freqY[0],freqY[-1]], aspect = 'auto', interpolation=intrp,cmap = clrmap, origin='lower')
sp.axis((freq_min,freq_max,freq2_min, freq2_max))
self.fig.colorbar(pplt)
self.canvas.show()
def SpectPlotter(self,f,Res, reg, TIM = None, out_name = None , flag3D='2D',frmt='png'):
Nx, Ny, Lx, Ly, N_nodes = self.OptsExtr()
ndav, int_step, cc = self.more_opts_extr()
actual_time = int(TIM)*int_step/ndav
Nx1, Nx2, Ny1, Ny2, Fmin, Fmax, res, res_x, res_y, clrmap, freq_min, freq_max,freq2_min, freq2_max = Res
res, res_x, res_y, Nx1, Nx2, Ny1, Ny2, freq_min,freq_max = int(res), int(res_x), int(res_y), float(Nx1),float(Nx2),float(Ny1),float(Ny2), float(freq_min), float(freq_max)
Nx1=int(np.rint(Nx1*Nx/Lx));Nx2=int(np.rint(Nx2*Nx/Lx))
Ny1=int(np.rint(Ny1*Ny/Ly));Ny2=int(np.rint(Ny2*Ny/Ly))
dX=Lx/Nx
dY=Ly/Ny
if Fmin == 0.:
Fmin = None
if Fmax == 0.:
Fmax= None
if Nx2==0:
Nx2 = Nx-1
if Ny2==0:
Ny2 = Ny-1
dx, dy = self.StepDef(Res[:-4])
dx=int(np.ceil(dx/2.))
dy=int(np.ceil(dy/2.))
aa = abs(fft2(f[Ny1:Ny2,Nx1:Nx2]))[:(Ny2-Ny1)/2:dy,:(Nx2-Nx1)/2:dx]
freqX = fftfreq(Nx2-Nx1, dX)[:(Nx2-Nx1)/2:dx]
freqY = fftfreq(Ny2-Ny1, dY)[:(Ny2-Ny1)/2:dy]
self.fig.clear()
if flag3D == '3D':
XX, YY = np.meshgrid(freqX, freqY)
Xmin_ind = int(len(freqX)*freq_min/freqX[-1])
Xmax_ind = int(len(freqX)*freq_max/freqX[-1])
Ymin_ind = int(len(freqY)*freq_min/freqY[-1])
Ymax_ind = int(len(freqY)*freq_max/freqY[-1])
sp = Axes3D(self.fig, title='time step = '+str(actual_time)+r'$ \tau_0$')
# sp.set_zlim3d(Fmin,Fmax)
# sp.set_xlim3d(freq_min,freq_max)
sp.set_ylim3d(freq_min,freq_max)
sp.plot_surface(XX[Ymin_ind:Ymax_ind,Xmin_ind:Xmax_ind],YY[Ymin_ind:Ymax_ind,Xmin_ind:Xmax_ind],aa[Ymin_ind:Ymax_ind,Xmin_ind:Xmax_ind],cmap = clrmap, linewidth=0)
if flag3D == '2D':
sp = self.fig.add_subplot(111, title='time step = '+str(actual_time)+r'$ \tau_0$')
pplt = sp.imshow(aa,vmin=Fmin,vmax=Fmax,extent=[freqX[0],freqX[-1],freqY[0],freqY[-1]], aspect = 'auto', interpolation=intrp,cmap = clrmap, origin='lower')
sp.set_xlabel(r'$k_x/k_0$',fontsize=14)
sp.set_ylabel(r'$k_y/k_0$',fontsize=14)
sp.axis((freq_min,freq_max,freq2_min, freq2_max))
self.fig.colorbar(pplt)
self.canvas.show()
if reg == 'wrt':
self.fig.savefig('./img/'+self.out_name_add+'_'+out_name+'_s_'+TIM+'.'+frmt)
clf()
return
def TemporalSpectPlot(self, d,wmin,wmax):
self.fig.clear()
sp = Axes3D(self.fig)
ndav, int_step, cc = self.more_opts_extr()
ll = len(d[0])-1
for i in ll-np.arange(ll):
y=i*np.ones(len(d)/2)
sp.plot(fftfreq(len(d), (d[1,0]-d[0,0])/(ndav/cc))[:len(d)/2], y ,abs(rfft(d[:,i]))[:-1])
sp.set_xlim3d(wmin,wmax)
sp.set_xlabel(r'$\omega/\omega_0$',fontsize=14)
sp.set_ylabel('node index',fontsize=14)
sp.set_zlabel(r'$\langle E_z \rangle_\omega$',fontsize=14)
self.canvas.show()
def __plot_frequency(audio, rate=rs.RATE):
samples = audio.shape[0]
data_fft = fft(audio)
fft_abs = abs(data_fft)
freq = pylab.fftfreq(samples, 1 / rate)
plt.xlim([10, rate / 2])
plt.xscale('log')
plt.grid(True)
plt.xlabel('Frequency (Hz)')
plt.plot(freq, fft_abs)
plt.show()
def calcFourier(self, yout, tspan):
'''
Calculate FFT and return magnitude spectrum and frequencies
freqs === Python array
aMags === numpy array
rMags === numpy array
'''
ActEC = yout[:, 3]
RepEC = yout[:, 9]
freqs = fftfreq(len(tspan), tspan[1] - tspan[0])
aMags = array(abs((fft(ActEC))))
rMags = array(abs((fft(RepEC))))
return freqs, aMags, rMags
def fitOscillations(self, harmonics=None):
""""""
t = self.variableArray
dt = t[1] - t[0]
data = self.orders[0]
amp_guess = (data.max() - data.min()) / 2
weights = abs(py.fft(data))**2
index = weights.argmax() if harmonics is None else harmonics
f_guess = py.fftfreq(t[-1] - t[0], dt)[index]
offset_guess = data.mean()
phi_guess = py.arccos(data[0] - offset_guess)
guesses = [amp_guess, f_guess, phi_guess, offset_guess]
self.guesses = guesses
coeffs, matcov = curve_fit(self.func, t, data, self.guesses)
self.coeffs = coeffs
self.matcov = matcov
def fft_filter(time, signal, result, window_func=pl.hanning, \
samp_freq=8, freq_limit = (0.0033, 0.04)):
"""
Applies an Band Pass filter to signal in the frequency domain and returns
filterd PSD.
In:
time : ndarray, relative R occurance times vector
signal : ndarray, HRV vector
result : dict, current fragment info (see process function)
samp_freq : int, signal sample frequency
freq_limit : tuple, (min, max) frequencies for band pass filter
Out:
freq_filt_log : ndarray, frequency in logarithm scale
spec_filt_log : ndarray, PSD in logarithm scale
"""
window = window_func(len(signal)) # window
signal_wed = signal * window
n = len(signal)/2
spec = (pl.absolute(pl.rfft(signal_wed))[:-1]/(n))**2 # entering to frequency domain
freq = pl.fftfreq(len(signal), 1.0/samp_freq)[:n] # get freqs axis values
spec_filt = pl.zeros(spec.shape, dtype='float')
freq_filt = pl.zeros(freq.shape, dtype='float') # same for filtered
for i in range(n): # filter by frequency
if pl.logical_and(freq_limit[0] <= abs(freq[i]), abs(freq[i]) <= freq_limit[1]):
freq_filt[i] = freq[i]
spec_filt[i] = spec[i]
else:
freq_filt[i] = 0 # fill invalid frequencies with 0 value
spec_filt[i] = 0
spec_filt = pl.ma.masked_equal(spec_filt,0) # cutt off invalid values
spec_filt = pl.ma.compressed(spec_filt)
freq_filt = pl.ma.masked_equal(freq_filt,0)
freq_filt = pl.ma.compressed(freq_filt)
spec_filt_log = pl.log10(spec_filt) # for output
freq_filt_log = pl.log10(freq_filt)
return freq_filt_log, spec_filt_log
def freqz(sosmat, nsamples=44100, sample_rate=44100, plot=True):
"""Plots Frequency response of sosmat."""
from pylab import np, plt, fft, fftfreq
x = np.zeros(nsamples)
x[nsamples/2] = 0.999
y, states = sosfilter_double_c(x, sosmat)
Y = fft(y)
f = fftfreq(len(x), 1.0/sample_rate)
if plot:
plt.grid(True)
plt.axis([0, sample_rate / 2, -100, 5])
L = 20*np.log10(np.abs(Y[:len(x)/2]) + 1e-17)
plt.semilogx(f[:len(x)/2], L, lw=0.5)
plt.hold(True)
plt.title('freqz sos filter')
plt.xlabel('Frequency / Hz')
plt.ylabel('Damping /dB(FS)')
plt.xlim((10, sample_rate/2))
plt.hold(False)
return x, y, f, Y
def freqz(sosmat, nsamples=44100, sample_rate=44100, plot=True):
"""Plots Frequency response of sosmat."""
from pylab import np, plt, fft, fftfreq
x = np.zeros(nsamples)
x[int(nsamples/2)] = 0.999
y, states = sosfilter_double_c(x, sosmat)
Y = fft(y)
f = fftfreq(len(x), 1.0/sample_rate)
if plot:
plt.grid(True)
plt.axis([0, sample_rate / 2, -100, 5])
L = 20*np.log10(np.abs(Y[:int(len(x)/2)]) + 1e-17)
plt.semilogx(f[:int(len(x)/2)], L, lw=0.5)
plt.hold(True)
plt.title(u'freqz sos filter')
plt.xlabel('Frequency / Hz')
plt.ylabel(u'Damping /dB(FS)')
plt.xlim((10, sample_rate/2))
plt.hold(False)
return x, y, f, Y
def SpecEvolPlot(self, d,windwidth,step,wmin,wmax, rowind):
dd=np.array([])
ndav, int_step, cc = self.more_opts_extr()
Tim=np.arange(windwidth, len(d)-windwidth,step)
for n in Tim:
dd=np.append(dd, np.abs(rfft(d[n-windwidth:n+windwidth,rowind]))[:-1])
Freq=fftfreq(2*windwidth, (d[1,0]-d[0,0])/(ndav/cc))[:windwidth]
if wmax!=0:
nFrqMax= int(wmax/(Freq[1]-Freq[0]))
else:
nFrqMax=len (Freq)
nFrqMin= int(wmin/(Freq[1]-Freq[0]))
dd=dd.reshape(len(Tim),len(Freq))[:,nFrqMin:nFrqMax].transpose()
self.fig.clear()
sp = self.fig.add_subplot(111)
pplt = sp.imshow(dd, origin='lower',aspect='auto',extent=[d[Tim[0],0]/(ndav/cc), d[Tim[-1],0]/(ndav/cc),Freq[nFrqMin],Freq[nFrqMax]])
sp.set_xlabel(r'$t/\tau_0$',fontsize=14)
sp.set_ylabel(r'$\omega/\omega_0$',fontsize=14)
self.fig.colorbar(pplt)
self.canvas.show()
return
def _calculatefdData(self,tdData):
#no need to copy it before (access member variable is ugly but shorter)
#calculate the fft of the X channel
fd=py.fft(tdData.getEX())
#calculate absolute and phase values
fdabs=abs(fd)
fdph=abs(py.unwrap(py.angle(fd)))
#calculate frequency axis
dfreq=py.fftfreq(tdData.num_points,tdData.dt)
#extrapolate phase to 0 and 0 frequency
fdph=self.removePhaseOffset(dfreq,fdph)
#set up the fdData array
t=py.column_stack((dfreq,fd.real,fd.imag,fdabs,fdph))
#this is so not nice!
self.fdData=t
unc=self.calculateFDunc()
t=self.getcroppedData(t,0,unc[-1,0])
#interpolate uncertainty
intpunc=interp1d(unc[:,0],unc[:,1:],axis=0)
unc=intpunc(t[:,0])
return py.column_stack((t,unc))
x_max = 10e-6
y_min = -10e-6
y_max = 10e-6
nx = 512
ny = 512
x = np.linspace(x_min, x_max, nx, endpoint=False)
y = np.linspace(y_min, y_max, ny, endpoint=False)
X, Y = np.meshgrid(x, y)
dx = x[1] - x[0]
dy = y[1] - y[0]
# Fourier space:
kx = 2 * pi * pl.fftfreq(len(x), d=dx)
ky = 2 * pi * pl.fftfreq(len(y), d=dy)
Kx, Ky = np.meshgrid(kx, ky)
# Laplace operator in Fourier space:
f_laplacian = -(Kx**2 + Ky**2)
# The Harmonic trap at our gridpoints, (n_elements x N):
V = 0.5 * m * omega**2 * (X**2 + Y**2)
@inmain_decorator()
def plot(i, t, psi):
if SHOW_PLOT:
rho_plot = np.abs(psi)**2
phase_plot = np.angle(psi)
#! /usr/bin/env python
from pylab import figure, loadtxt, arange, ones, fftfreq, rfft
from mpl_toolkits.mplot3d import Axes3D
fig = figure()
ax = Axes3D(fig)
inp = raw_input("input xfel_xx number xx and node index:").split(' ')
xx = inp[0]
node = inp[1]
d = loadtxt('../xfel_' + xx + '/etc/fld_00' + node + '_000')
ll = len(d[0]) - 1
for i in ll - arange(ll):
y = i * ones(len(d) / 2)
ax.plot(fftfreq(len(d), 0.04)[:len(d) / 2], y, abs(rfft(d[:, i]))[:-1])
ax.set_xlim3d(0.9, 1.1)
fig.show()
fig.show()
raw_input("Press Enter to continue...")
def SpectSpacePlotter(self,f,Res, reg, TIM = None, out_name = None, flag3D='2D', frmt='png'):
Nx, Ny, Lx, Ly, N_nodes = self.OptsExtr()
ndav, int_step, cc = self.more_opts_extr()
actual_time = int(TIM)*int_step/ndav
Nx1, Nx2, Ny1, Ny2, Fmin, Fmax, res, res_x, res_y, clrmap, freq_min, freq_max,freq2_min, freq2_max, ax = Res
res, res_x, res_y, Nx1, Nx2, Ny1, Ny2,freq_max = int(res), int(res_x), int(res_y), float(Nx1),float(Nx2),float(Ny1),float(Ny2), float(freq_max)
Nx1=int(np.rint(Nx1*Nx/Lx));Nx2=int(np.rint(Nx2*Nx/Lx))
Ny1=int(np.rint(Ny1*Ny/Ly));Ny2=int(np.rint(Ny2*Ny/Ly))
dX=Lx/Nx
dY=Ly/Ny
X=np.linspace(0,Lx,Nx)
Y=np.linspace(0,Ly,Ny)
dx, dy = self.StepDef(Res[:-5])
if Fmin == 0.:
Fmin = None
if Fmax == 0.:
Fmax= None
if Nx2==0:
Nx2 = Nx-1
if Ny2==0:
Ny2 = Ny-1
if ax=='x':
Nn1=Nx
Nn2=Ny
Xx=X
Yy=Y
Ll=Ly
ddx=int(np.ceil(dx/2.))
ddy=dy
freq_min, freq_max = freq_min, freq_max
elif ax=='y':
f=f.transpose()
Nn1=np.shape(f)[1]
Nn2=Nx
Xx=Y
Yy=X
Ll=Lx
ddx=int(np.ceil(dy/2.))
ddy=dx
freq_min, freq_max = freq2_min, freq2_max
datFFT = np.zeros((Nn2, Nn1/2+1))
XFFT = abs(fftfreq( Nn1, Xx[1])[:Nn1/2+1])
for j in np.arange(Nn2):
datFFT[j] = abs(rfft(f[j]))
myextent=[XFFT[0],XFFT[-1],Yy[0],Yy[-1]]
self.fig.clear()
if flag3D == '3D':
XX, YY = np.meshgrid(XFFT, Yy)
sp = Axes3D(self.fig, title='time step = '+str(actual_time)+r'$ \tau_0$')
sp.plot_surface(XX,YY,datFFT, cmap = clrmap, linewidth=0)
sp.set_zlim3d(Fmin,Fmax)
if flag3D == '2D':
sp = self.fig.add_subplot(111, title='time step = '+str(actual_time)+r'$ \tau_0$')
if ax=='x':
sp.set_ylabel(r'$y/\lambda_0$',fontsize=14)
sp.set_xlabel(r'$k_x/k_0$',fontsize=14)
elif ax=='y':
sp.set_ylabel(r'$x/\lambda_0$',fontsize=14)
sp.set_xlabel(r'$k_y/k_0$', fontsize=14)
pplt = sp.imshow(datFFT[::ddy,::ddx],extent=myextent, aspect = 'auto', interpolation=intrp,origin='lower',vmin=Fmin, vmax=Fmax, cmap = clrmap)
sp.axis((freq_min,freq_max,0,Ll))
self.fig.colorbar(pplt)
self.canvas.show()
if reg == 'wrt':
self.fig.savefig('./img/'+self.out_name_add+'_'+out_name+'_s'+ax+'_'+TIM+'.'+frmt)
clf()
return
def freqz(ofb, length_sec=6, ffilt=False, plot=True):
"""Computes the IR and FRF of a digital filter.
Parameters
----------
ofb : FractionalOctaveFilterbank object
length_sec : scalar
Length of the impulse response test signal.
ffilt : bool
Backard forward filtering. Effectiv order is doubled then.
plot : bool
Create Plots or not.
Returns
-------
x : ndarray
Impulse test signal.
y : ndarray
Impules responses signal of the filters.
f : ndarray
Frequency vector for the FRF.
Y : Frequency response (FRF) of the summed filters.
"""
from pylab import np, plt, fft, fftfreq
x = np.zeros(length_sec * ofb.sample_rate)
x[int(length_sec * ofb.sample_rate / 2)] = 0.9999
if not ffilt:
y, states = ofb.filter_mimo_c(x)
y = y[:, :, 0]
else:
y, states = ofb.filter(x, ffilt=ffilt)
s = np.zeros(len(x))
len_x_2 = int(len(x) / 2)
for i in range(y.shape[1]):
s += y[:, i]
X = fft(y[:, i]) # sampled frequency response
f = fftfreq(len(x), 1.0 / ofb.sample_rate)
if plot:
fig = plt.figure('freqz filter bank')
plt.grid(True)
plt.axis([0, ofb.sample_rate / 2, -100, 5])
L = 20 * np.log10(np.abs(X[:len_x_2]) + 1e-17)
plt.semilogx(f[:len_x_2], L, lw=0.5)
Y = fft(s)
if plot:
plt.title(u'freqz() Filter Bank')
plt.xlabel('Frequency / Hz')
plt.ylabel(u'Damping /dB(FS)')
plt.xlim((10, ofb.sample_rate / 2))
plt.figure('sum')
L = 20 * np.log10(np.abs(Y[:len_x_2]) + 1e-17)
plt.semilogx(f[:len_x_2], L, lw=0.5)
level_input = 10 * np.log10(np.sum(x**2))
level_output = 10 * np.log10(np.sum(s**2))
plt.axis([5, ofb.sample_rate / 1.8, -50, 5])
plt.grid(True)
plt.title('Sum of filter bands')
plt.xlabel('Frequency / Hz')
plt.ylabel(u'Damping /dB(FS)')
print('sum level', level_output, level_input)
return x, y, f, Y
convolution = numpy.fft.ifft(
pl.multiply(ftilda, gtilda)
) #Convolution using properties of fourier transforms and convolution
return pl.divide(convolution, len(ftilda)) * T
a = tophat(t, 3, 5)
b = gaussian(t).tolist()
c = split_gaussian(t)
pl.figure("h(t)")
pl.plot(t, a, label="h(t)")
pl.plot(t, b, label="g(t)")
#pl.figure("convolution")
pl.plot(t, convolve(a, c), label="h(t)*g(t)")
pl.legend()
print(pl.trapz(convolve(a, c), t,
dx=0.0001)) #finds area under convolution curve
pl.figure()
pl.plot(pl.fftfreq(N, d=dT),
numpy.fft.fft(a),
label=r"$\mathcal{F}(h(t))(\omega)$")
pl.legend()
pl.figure()
pl.plot(pl.fftfreq(N, d=dT),
numpy.fft.fft(b),
label=r"$\mathcal{F}(g(t))(\omega)$")
pl.legend()
def freqz(ofb, length_sec=6, ffilt=False, plot=True):
"""Computes the IR and FRF of a digital filter.
Parameters
----------
ofb : FractionalOctaveFilterbank object
length_sec : scalar
Length of the impulse response test signal.
ffilt : bool
Backard forward filtering. Effectiv order is doubled then.
plot : bool
Create Plots or not.
Returns
-------
x : ndarray
Impulse test signal.
y : ndarray
Impules responses signal of the filters.
f : ndarray
Frequency vector for the FRF.
Y : Frequency response (FRF) of the summed filters.
"""
from pylab import np, plt, fft, fftfreq
x = np.zeros(length_sec*ofb.sample_rate)
x[length_sec*ofb.sample_rate/2] = 0.9999
if not ffilt:
y, states = ofb.filter_mimo_c(x)
y = y[:, :, 0]
else:
y, states = ofb.filter(x, ffilt=ffilt)
s = np.zeros(len(x))
for i in range(y.shape[1]):
s += y[:, i]
X = fft(y[:, i]) # sampled frequency response
f = fftfreq(len(x), 1.0/ofb.sample_rate)
if plot:
fig = plt.figure('freqz filter bank')
plt.grid(True)
plt.axis([0, ofb.sample_rate / 2, -100, 5])
L = 20*np.log10(np.abs(X[:len(x)/2]) + 1e-17)
plt.semilogx(f[:len(x)/2], L, lw=0.5)
plt.hold(True)
Y = fft(s)
if plot:
plt.title('freqz() Filter Bank')
plt.xlabel('Frequency / Hz')
plt.ylabel('Damping /dB(FS)')
plt.xlim((10, ofb.sample_rate/2))
plt.hold(False)
plt.figure('sum')
L = 20*np.log10(np.abs(Y[:len(x)/2]) + 1e-17)
plt.semilogx(f[:len(x)/2], L, lw=0.5)
level_input = 10*np.log10(np.sum(x**2))
level_output = 10*np.log10(np.sum(s**2))
plt.axis([5, ofb.sample_rate/1.8, -50, 5])
plt.grid(True)
plt.title('Sum of filter bands')
plt.xlabel('Frequency / Hz')
plt.ylabel('Damping /dB(FS)')
print('sum level', level_output, level_input)
return x, y, f, Y
if not respaddr: raise RuntimeError
except Exception,e:
logging.error('Problems loading response file: %s => %s' % (filename, e))
for rec in tr.iter_record():
data = array( rec.trdata() )
logging.debug( 'Total samples: %s ' % len(data) )
npts = len(data)
logging.debug('compute the one-dimensional discrete Fourier Transform')
fft_values = fft(data)[0:int(npts/2)+1]
# Return the Discrete Fourier Transform sample frequencies
logging.debug('compute the Fourier Transform sample frequencies')
freq = fftfreq(len(data), d=1.0/samprate)[range(0,npts/2+1)]
# the last element is negative, because of the symmetry, but should
# be positive
fft_values[-1] *= -1
convolved = []
for f in freq:
w = f * 2 * pi
convolved.append( response._eval_response(respaddr, w ) )
data = irfft( convolved * fft_values )
logging.debug( 'Total samples: %s ' % len(data) )
rec.trputdata( data )
nsx_basic_header = nsx.read_basic_header(f_nsx)
lfp1 = nsx.read_electrode(f = f_nsx,
basic_header = nsx_basic_header,
electrode = 14,
tstart_ms = 5000,
t_dur_ms = 1000)
pylab.subplot(2,1,1)
t = pylab.arange(lfp1.size)/2000.
pylab.plot(t, lfp1)
offset = 0
t_window_ms = 500
N_wave = t_window_ms * 2
mean_ft = pylab.zeros(N_wave, dtype='float')
for n in range(100):
lfp1 = nsx.read_electrode(f = f_nsx,
basic_header = nsx_basic_header,
electrode = 14,
tstart_ms = t_window_ms*n + offset,
t_dur_ms = t_window_ms)
ft = pylab.absolute(pylab.fft(lfp1))
mean_ft += ft
pylab.subplot(2,1,2)
F = pylab.fftfreq(mean_ft.size, d = 1/2000.)
pylab.semilogy(F, mean_ft/50.)
pylab.xlabel('F (Hz)')
pylab.ylabel('Signal')
#! /usr/bin/env python
from pylab import figure, loadtxt, arange, ones,fftfreq, rfft
from mpl_toolkits.mplot3d import Axes3D
fig = figure()
ax = Axes3D(fig)
inp = raw_input("input xfel_xx number xx and node index:").split(' ')
xx = inp[0]
node=inp[1]
d = loadtxt('../xfel_'+xx+'/etc/fld_00'+node+'_000')
ll = len(d[0])-1
for i in ll-arange(ll):
y=i*ones(len(d)/2)
ax.plot(fftfreq(len(d), 0.04)[:len(d)/2], y ,abs(rfft(d[:,i]))[:-1])
ax.set_xlim3d(0.9,1.1)
fig.show()
fig.show()
raw_input("Press Enter to continue...")
f_nsx = open(nev_dir + ns3_fname, 'rb')
nsx_basic_header = nsx.read_basic_header(f_nsx)
lfp1 = nsx.read_electrode(f=f_nsx,
basic_header=nsx_basic_header,
electrode=14,
tstart_ms=5000,
t_dur_ms=1000)
pylab.subplot(2, 1, 1)
t = pylab.arange(lfp1.size) / 2000.
pylab.plot(t, lfp1)
offset = 0
t_window_ms = 500
N_wave = t_window_ms * 2
mean_ft = pylab.zeros(N_wave, dtype='float')
for n in range(100):
lfp1 = nsx.read_electrode(f=f_nsx,
basic_header=nsx_basic_header,
electrode=14,
tstart_ms=t_window_ms * n + offset,
t_dur_ms=t_window_ms)
ft = pylab.absolute(pylab.fft(lfp1))
mean_ft += ft
pylab.subplot(2, 1, 2)
F = pylab.fftfreq(mean_ft.size, d=1 / 2000.)
pylab.semilogy(F, mean_ft / 50.)
pylab.xlabel('F (Hz)')
pylab.ylabel('Signal')
