Contents
ezffti - initializes the array WSAVE, which is used in both
EZFFTF and EZFFTB.
SUBROUTINE EZFFTI(N, WSAVE)
INTEGER N
REAL WSAVE(*)
SUBROUTINE EZFFTI_64(N, WSAVE)
INTEGER*8 N
REAL WSAVE(*)
F95 INTERFACE
SUBROUTINE EZFFTI(N, WSAVE)
INTEGER :: N
REAL, DIMENSION(:) :: WSAVE
SUBROUTINE EZFFTI_64(N, WSAVE)
INTEGER(8) :: N
REAL, DIMENSION(:) :: WSAVE
C INTERFACE
#include <sunperf.h>
void ezffti(int n, float *wsave);
void ezffti_64(long n, float *wsave);
N (input) Length of the sequence to be transformed. N >= 0.
WSAVE (input)
On entry, an array with a dimension of at least (3
* N + 15). The same work array can be used for
both EZFFTF and EZFFTB as long as N remains
unchanged. Different WSAVE arrays are required
for different values of N. This initialization
does not have to be repeated between calls to
EZFFTF or EZFFTB as long as N and WSAVE remain
unchanged, thus subsequent transforms can be
obtained faster than the first.