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