[SciPy-user] About fftpack

Couge Chen couge.chen@gmail....
Tue Oct 16 22:46:50 CDT 2007


Hi all,

Here is a piece of C++ codes to do 2D IFFT from a square complex array in
K-space to a real array with the same size in real sapce.

p_forward = rfftwnd_create_plan(numOfPoints.dim(),numOfPoints,
FFTW_REAL_TO_COMPLEX, FFTW_ESTIMATE);
:
:
static void FFT(Array2D< double > &in, Array2D< fftw_complex > &out) {
  rfftwnd_one_real_to_complex(p_forward,in[0],out[0]); };
:
:
myFFTclass::IFFT(complex_array,real_array);


For those C++ codes, fftw2.1.5 is used. Now I want to translate those codes
into Python codes with scipy.fftpack. I used fftpack.ifft2(complex_array),
but got a new complex array. Then I compared the real part of this new
complex array with the "real_array" calculated by C++. They looked quite
different.
So I was wondering how I use the function of fftpack to generate the same
"real_array".  Anyone could help me?

Thanks a lot!

Couge
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