vcffti man page on OpenIndiana

vcffti man page on OpenIndiana

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vcffti(3P)		    Sun Performance Library		    vcffti(3P)

NAME
       vcffti  -  initialize the array WSAVE, which is used in both VCFFTF and
       VCFFTB.

SYNOPSIS
       SUBROUTINE VCFFTI(N, WSAVE)

       COMPLEX WSAVE(*)
       INTEGER N

       SUBROUTINE VCFFTI_64(N, WSAVE)

       COMPLEX WSAVE(*)
       INTEGER*8 N

   F95 INTERFACE
       SUBROUTINE VFFTI(N, WSAVE)

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

       SUBROUTINE VFFTI_64(N, WSAVE)

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

   C INTERFACE
       #include <sunperf.h>

       void vcffti(int n, complex *wsave);

       void vcffti_64(long n, complex *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.
		 VCFFTI	 needs	to  be	called	only  once to initialize WSAVE
		 before calling VCFFTF and/or VCFFTB 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			    vcffti(3P)

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