cffti (3p)

Name

cffti - initialize the array WSAVE, which is used in both CFFTF and CFFTB.

Synopsis

SUBROUTINE CFFTI(N, WSAVE)

INTEGER N
REAL WSAVE(*)

SUBROUTINE CFFTI_64(N, WSAVE)

INTEGER*8 N
REAL WSAVE(*)




F95 INTERFACE
SUBROUTINE CFFTI(N, WSAVE)

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

SUBROUTINE CFFTI_64(N, WSAVE)

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




C INTERFACE
#include <sunperf.h>

void cffti(int n, float *wsave);

void cffti_64(long n, float *wsave);

Description

Oracle Solaris Studio Performance Library                            cffti(3P)



NAME
       cffti  -  initialize  the  array WSAVE, which is used in both CFFTF and
       CFFTB.


SYNOPSIS
       SUBROUTINE CFFTI(N, WSAVE)

       INTEGER N
       REAL WSAVE(*)

       SUBROUTINE CFFTI_64(N, WSAVE)

       INTEGER*8 N
       REAL WSAVE(*)




   F95 INTERFACE
       SUBROUTINE CFFTI(N, WSAVE)

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

       SUBROUTINE CFFTI_64(N, WSAVE)

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




   C INTERFACE
       #include <sunperf.h>

       void cffti(int n, float *wsave);

       void cffti_64(long n, float *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.
                 CFFTI  needs  to be called only once to initialize array WORK
                 before calling CFFTF and/or  CFFTB  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                         cffti(3P)