Contents
vcffti - initialize the array WSAVE, which is used in both
VCFFTF and VCFFTB.
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);
N (input) Length of the sequence to be transformed. N >= 0.
WSAVE (input)
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.