vrffti(3P) Sun Performance Library vrffti(3P)NAMEvrffti - initialize the array WSAVE, which is used in both VRFFTF and
VRFFTB.
SYNOPSIS
SUBROUTINE VRFFTI(N, WSAVE)
INTEGER N
REAL WSAVE(*)
SUBROUTINE VRFFTI_64(N, WSAVE)
INTEGER*8 N
REAL WSAVE(*)
F95 INTERFACE
SUBROUTINE VFFTI(N, WSAVE)
INTEGER :: N
REAL, DIMENSION(:) :: WSAVE
SUBROUTINE VFFTI_64(N, WSAVE)
INTEGER(8) :: N
REAL, DIMENSION(:) :: WSAVE
C INTERFACE
#include <sunperf.h>
void vrffti(int n, float *wsave);
void vrffti_64(long n, float *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 vrffti(3P)