vcffti
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
SUBROUTINE VFFTI( N, WSAVE)
COMPLEX, DIMENSION(:) :: WSAVE
INTEGER :: N
SUBROUTINE VFFTI_64( N, WSAVE)
COMPLEX, DIMENSION(:) :: WSAVE
INTEGER(8) :: N
#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.