python - How to get complex64 output from numpy.fft? -


i have following code:

ga=rfft2(a)

a type float32, ga comes out complex128 doubling data. how can out complex64 data? isn't default functionality fftw?

well, seems type defined quite deep in c code. fftpack_litemodule.c uses npy_cdouble array type , complex128. solution see transform array complex64 using astype(np.complex64) or use scipy.fftpack package returns array of float64 encoding complex values as:

[y(0),re(y(1)),im(y(1)),...,re(y(n/2))]              if n [y(0),re(y(1)),im(y(1)),...,re(y(n/2)),im(y(n/2))]   if n odd

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