Primitive Fast Fourier Transform

This subroutine is not intended to be used directly in applications. It is used by other library subroutines and is described here to supplement the functional descriptions of these other routines. This subroutine computes one-dimensional complex Fourier transforms using the Cooley-Tukey FFT. For help in understanding Fourier Transforms, see here .
This software is part of the MATH77/mathc90 collection here.

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