dfftf man page on OpenIndiana

dfftf man page on OpenIndiana

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dfftf(3P)		    Sun Performance Library		     dfftf(3P)

NAME
       dfftf  -	 compute the Fourier coefficients of a periodic sequence.  The
       FFT operations are unnormalized, so a call of DFFTF followed by a  call
       of DFFTB will multiply the input sequence by N.

SYNOPSIS
       SUBROUTINE DFFTF(N, X, WSAVE)

       INTEGER N
       DOUBLE PRECISION X(*), WSAVE(*)

       SUBROUTINE DFFTF_64(N, X, WSAVE)

       INTEGER*8 N
       DOUBLE PRECISION X(*), WSAVE(*)

   F95 INTERFACE
       SUBROUTINE FFTF([N], X, WSAVE)

       INTEGER :: N
       REAL(8), DIMENSION(:) :: X, WSAVE

       SUBROUTINE FFTF_64([N], X, WSAVE)

       INTEGER(8) :: N
       REAL(8), DIMENSION(:) :: X, WSAVE

   C INTERFACE
       #include <sunperf.h>

       void dfftf(int n, double *x, double *wsave);

       void dfftf_64(long n, double *x, double *wsave);

ARGUMENTS
       N (input) Length	 of the sequence to be transformed.  These subroutines
		 are most efficient when N is a product of small primes.  N >=
		 0.

       X (input/output)
		 On  entry, an array of length N containing the sequence to be
		 transformed.

       WSAVE (input/output)
		 On entry, WSAVE must be an array of dimension (2 * N + 15) or
		 greater and must have been initialized by DFFTI.

				  6 Mar 2009			     dfftf(3P)

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