Function Fft-Radix-2-Blas-Complex-Store!

Part of:

package lisplab
( fft-radix-2-blas-complex-store! < direction > < x > < n > < start > < step > )
Destrutive, radix 2 fast fourier transform. Direction is either :f for
forward or :r for reverse transform. Input must be a
vector of complex double float