I am trying to extract the n-point DFT of using fft for vector X. I am a MATLAB user, so, I run fft(X,n) when length(X)=16 and n=32. But it doesn’t work since fft in FFTW Pkg is limited to the length of vector X. Is there a way to get a vector with greater length by using fft?

Just pad X with zeros to get to length n.

Fft(x,n) when n>length(x)

stillyslalom October 6, 2021, 2:46pm 2

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