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Modified class DCfc: calculation of fft bins after Bath.

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This commit is contained in:
Ludger Küperkoch 2015-09-23 17:02:27 +02:00
parent c790b4f353
commit b391f5e082
1 changed files with 7 additions and 5 deletions
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10
pylot/core/analysis/magnitude.py
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@ -156,15 +156,17 @@ class DCfc(Magnitude):
# fft # fft
fny = tr.stats.sampling_rate / 2 fny = tr.stats.sampling_rate / 2
N = 1024 l = len(xdat) / tr.stats.sampling_rate
n = tr.stats.sampling_rate * l # number of fft bins after Bath
# find next power of 2 of data length
m = pow(2, np.ceil(np.log(len(xdat)) / np.log(2)))
N = int(np.power(m, 2))
y = tr.stats.delta * np.fft.fft(xdat, N) y = tr.stats.delta * np.fft.fft(xdat, N)
Y = abs(y[: N/2]) Y = abs(y[: N/2])
L = (N - 1) / tr.stats.sampling_rate L = (N - 1) / tr.stats.sampling_rate
f = np.arange(0, fny, 1/L) f = np.arange(0, fny, 1/L)
#if self.getiplot() > 1: if self.getiplot() > 1:
iplot=2
if iplot > 1:
f1 = plt.figure(1) f1 = plt.figure(1)
plt.subplot(2,1,1) plt.subplot(2,1,1)
plt.plot(t, np.multiply(tr, 1000), 'k') # show displacement in mm plt.plot(t, np.multiply(tr, 1000), 'k') # show displacement in mm