NAME

zfftf - compute the Fourier coefficients of a periodic sequence. The FFT operations are unnormalized, so a call of ZFFTF followed by a call of ZFFTB will multiply the input sequence by N.

SYNOPSIS

  SUBROUTINE ZFFTF( N, X, WSAVE)
  DOUBLE COMPLEX X(*)
  INTEGER N
  DOUBLE PRECISION WSAVE(*)
  SUBROUTINE ZFFTF_64( N, X, WSAVE)
  DOUBLE COMPLEX X(*)
  INTEGER*8 N
  DOUBLE PRECISION WSAVE(*)

F95 INTERFACE

  SUBROUTINE FFTF( [N], X, WSAVE)
  COMPLEX(8), DIMENSION(:) :: X
  INTEGER :: N
  REAL(8), DIMENSION(:) :: WSAVE
  SUBROUTINE FFTF_64( [N], X, WSAVE)
  COMPLEX(8), DIMENSION(:) :: X
  INTEGER(8) :: N
  REAL(8), DIMENSION(:) :: WSAVE

C INTERFACE

#include <sunperf.h>

void zfftf(int n, doublecomplex *x, double *wsave);

void zfftf_64(long n, doublecomplex *x, double *wsave);

ARGUMENTS