zfft2i (3p)

Name

zfft2i - initialize the array WSAVE, which is used in both the forward and backward transforms.

Synopsis

SUBROUTINE ZFFT2I(M, N, WORK)

INTEGER M, N
DOUBLE PRECISION WORK(*)

SUBROUTINE ZFFT2I_64(M, N, WORK)

INTEGER*8 M, N
DOUBLE PRECISION WORK(*)




F95 INTERFACE
SUBROUTINE ZFFT2I(M, N, WORK)

INTEGER :: M, N
REAL(8), DIMENSION(:) :: WORK

SUBROUTINE ZFFT2I_64(M, N, WORK)

INTEGER(8) :: M, N
REAL(8), DIMENSION(:) :: WORK




C INTERFACE
#include <sunperf.h>

void zfft2i(int m, int n, double *work);

void zfft2i_64(long m, long n, double *work);

Description

Oracle Solaris Studio Performance Library                           zfft2i(3P)



NAME
       zfft2i  - initialize the array WSAVE, which is used in both the forward
       and backward transforms.


SYNOPSIS
       SUBROUTINE ZFFT2I(M, N, WORK)

       INTEGER M, N
       DOUBLE PRECISION WORK(*)

       SUBROUTINE ZFFT2I_64(M, N, WORK)

       INTEGER*8 M, N
       DOUBLE PRECISION WORK(*)




   F95 INTERFACE
       SUBROUTINE ZFFT2I(M, N, WORK)

       INTEGER :: M, N
       REAL(8), DIMENSION(:) :: WORK

       SUBROUTINE ZFFT2I_64(M, N, WORK)

       INTEGER(8) :: M, N
       REAL(8), DIMENSION(:) :: WORK




   C INTERFACE
       #include <sunperf.h>

       void zfft2i(int m, int n, double *work);

       void zfft2i_64(long m, long n, double *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.   ZFFT2I  needs to be called only once to initialize
                 array WORK before calling ZFFT2F and/or ZFFT2B 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.




                                  7 Nov 2015                        zfft2i(3P)