Contents
cfft2i - initialize the array WSAVE, which is used in both
the forward and backward transforms.
SUBROUTINE CFFT2I(M, N, WORK)
INTEGER M, N
REAL WORK(*)
SUBROUTINE CFFT2I_64(M, N, WORK)
INTEGER*8 M, N
REAL WORK(*)
F95 INTERFACE
SUBROUTINE CFFT2I(M, N, WORK)
INTEGER :: M, N
REAL, DIMENSION(:) :: WORK
SUBROUTINE CFFT2I_64(M, N, WORK)
INTEGER(8) :: M, N
REAL, DIMENSION(:) :: WORK
C INTERFACE
#include <sunperf.h>
void cfft2i(int m, int n, float *work);
void cfft2i_64(long m, long n, float *work);
M (input) Number of rows to be transformed. M >= 0.
N (input) Number of columns to be transformed. N >= 0.
WORK (input/output)
On entry, an array of dimension (4 * (M + N) + 30)
or greater. CFFT2I needs to be called only once
to initialize array WORK before calling CFFT2F
and/or CFFT2B if M, N and WORK 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.