DFT workspace for calculations?

DFT workspace for calculations?

When a DFT routine is called to compute an FFT, what does the function do as far as a workspace for its calculations? I'm assuming that the data is manipulated before being copied to the memory pointed to by the results pointer (whether it be in-place or out-of-place).

Does the DFT routine make a malloc call for memory or does it do its work on the stack?

Les

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