zffti (3p)

Name

zffti - initialize the array WSAVE, which is used in both ZFFTF and ZFFTB.

Synopsis

SUBROUTINE ZFFTI(N, WSAVE)

INTEGER N
DOUBLE PRECISION WSAVE(*)

SUBROUTINE ZFFTI_64(N, WSAVE)

INTEGER*8 N
DOUBLE PRECISION WSAVE(*)




F95 INTERFACE
SUBROUTINE ZFFTI(N, WSAVE)

INTEGER :: N
REAL(8), DIMENSION(:) :: WSAVE

SUBROUTINE ZFFTI_64(N, WSAVE)

INTEGER(8) :: N
REAL(8), DIMENSION(:) :: WSAVE




C INTERFACE
#include <sunperf.h>

void zffti(int n, double *wsave);

void zffti_64(long n, double *wsave);

Description

Oracle Solaris Studio Performance Library                            zffti(3P)



NAME
       zffti  -  initialize  the  array WSAVE, which is used in both ZFFTF and
       ZFFTB.


SYNOPSIS
       SUBROUTINE ZFFTI(N, WSAVE)

       INTEGER N
       DOUBLE PRECISION WSAVE(*)

       SUBROUTINE ZFFTI_64(N, WSAVE)

       INTEGER*8 N
       DOUBLE PRECISION WSAVE(*)




   F95 INTERFACE
       SUBROUTINE ZFFTI(N, WSAVE)

       INTEGER :: N
       REAL(8), DIMENSION(:) :: WSAVE

       SUBROUTINE ZFFTI_64(N, WSAVE)

       INTEGER(8) :: N
       REAL(8), DIMENSION(:) :: WSAVE




   C INTERFACE
       #include <sunperf.h>

       void zffti(int n, double *wsave);

       void zffti_64(long n, double *wsave);



ARGUMENTS
       N (input) Length of the sequence to be transformed.  N >= 0.


       WSAVE (input/output)
                 On entry, an array of dimension (4 *  N  +  15)  or  greater.
                 ZFFTI  needs  to be called only once to initialize array WORK
                 before calling ZFFTF and/or  ZFFTB  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.




                                  7 Nov 2015                         zffti(3P)