vdffti man page on OpenIndiana

vdffti man page on OpenIndiana

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vdffti(3P)		    Sun Performance Library		    vdffti(3P)

NAME
       vdffti  -  initialize the array WSAVE, which is used in both VRFFTF and
       VRFFTB.

SYNOPSIS
       SUBROUTINE VDFFTI(N, WSAVE)

       INTEGER N
       DOUBLE PRECISION WSAVE(*)

       SUBROUTINE VDFFTI_64(N, WSAVE)

       INTEGER*8 N
       DOUBLE PRECISION WSAVE(*)

   F95 INTERFACE
       SUBROUTINE VFFTI(N, WSAVE)

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

       SUBROUTINE VFFTI_64(N, WSAVE)

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

   C INTERFACE
       #include <sunperf.h>

       void vdffti(int n, double *wsave);

       void vdffti_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 (N + 15) or greater.	VRFFTI
		 needs to be called only once to initialize WSAVE before call‐
		 ing VRFFTF and/or VRFFTB 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			    vdffti(3P)

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