dffti man page on OpenIndiana

dffti man page on OpenIndiana

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dffti(3P)		    Sun Performance Library		     dffti(3P)

NAME
       dffti  -	 initialize  the  array WSAVE, which is used in both DFFTF and
       DFFTB.

SYNOPSIS
       SUBROUTINE DFFTI(N, WSAVE)

       INTEGER N
       DOUBLE PRECISION WSAVE(*)

       SUBROUTINE DFFTI_64(N, WSAVE)

       INTEGER*8 N
       DOUBLE PRECISION WSAVE(*)

   F95 INTERFACE
       SUBROUTINE FFTI(N, WSAVE)

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

       SUBROUTINE FFTI_64(N, WSAVE)

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

   C INTERFACE
       #include <sunperf.h>

       void dffti(int n, double *wsave);

       void dffti_64(long n, double *wsave);

ARGUMENTS
       N (input) Length of the sequence to be transformed.  N >= 0.

       WSAVE (input/output)
		 On entry, an array of dimension (2 *  N  +  15)  or  greater.
		 DFFTI	needs  to be called only once to initialize array WORK
		 before calling DFFTF and/or  DFFTB  if	 N  and	 WSAVE	remain
		 unchanged  between  these calls.  Thus, subsequent transforms
		 or inverse transforms of same size  can  be  obtained	faster
		 than  the  first  since they do not require initialization of
		 the workspace.

				  6 Mar 2009			     dffti(3P)

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