cfft2i(3P) Sun Performance Library cfft2i(3P)NAMEcfft2i - initialize the array WSAVE, which is used in both the forward
and backward transforms.
SYNOPSIS
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);
ARGUMENTS
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 initializa‐
tion of the workspace.
6 Mar 2009 cfft2i(3P)
