I am doing two dimensional fft process by cufft. Processing type is real to complex, so the size of out array is NX * (NY / 2 + 1) which is non redundant. But I need the full coefficients containing the redundant ones. How can i get them all? Thanks in advance.
How can I get the full fft coefficients by cufft?
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Convert all your real values to complex values. This is trivial and simply involves providing a zero imaginary value to go along with each real value.
Then do a cufft C2C (complex to complex) transform, which will be of size NX*NY, both on the input size, and the output side. There will be no reduction for redundancy.