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Another update from ingydotnet^djgoku

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Ingy döt Net 2015-11-18 06:14:39 +00:00
parent 91df62d461
commit 948b86eafa
7604 changed files with 108452 additions and 22726 deletions
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10
Task/Fast-Fourier-transform/Python/fast-fourier-transform-1.py
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@ -3,11 +3,11 @@ from cmath import exp, pi
def fft(x):
N = len(x)
if N <= 1: return x
even = fft2(x[0::2])
odd = fft2(x[1::2])
T= [exp(-2j*pi*k/N)*odd[k] for k in xrange(N/2)]
return [even[k] + T[k] for k in xrange(N/2)] + \
[even[k] - T[k] for k in xrange(N/2)]
even = fft(x[0::2])
odd = fft(x[1::2])
T= [exp(-2j*pi*k/N)*odd[k] for k in range(N//2)]
return [even[k] + T[k] for k in range(N//2)] + \
[even[k] - T[k] for k in range(N//2)]
print( ' '.join("%5.3f" % abs(f)
for f in fft([1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0])) )