vzffti man page on OpenIndiana

vzffti man page on OpenIndiana

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vzffti(3P)		    Sun Performance Library		    vzffti(3P)

NAME
       vzffti  -  initialize the array WSAVE, which is used in both VZFFTF and
       VZFFTB.

SYNOPSIS
       SUBROUTINE VZFFTI(N, WSAVE)

       DOUBLE COMPLEX WSAVE(*)
       INTEGER N

       SUBROUTINE VZFFTI_64(N, WSAVE)

       DOUBLE COMPLEX WSAVE(*)
       INTEGER*8 N

   F95 INTERFACE
       SUBROUTINE VFFTI(N, WSAVE)

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

       SUBROUTINE VFFTI_64(N, WSAVE)

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

   C INTERFACE
       #include <sunperf.h>

       void vzffti(int n, doublecomplex *wsave);

       void vzffti_64(long n, doublecomplex *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.	VZFFTI
		 needs to be called only once to initialize WSAVE before call‐
		 ing VZFFTF and/or VZFFTB 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			    vzffti(3P)

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