rffti (3p)

Name

rffti - initialize the array WSAVE, which is used in both RFFTF and RFFTB.

Synopsis

SUBROUTINE RFFTI(N, WSAVE)

INTEGER N
REAL WSAVE(*)

SUBROUTINE RFFTI_64(N, WSAVE)

INTEGER*8 N
REAL WSAVE(*)




F95 INTERFACE
SUBROUTINE FFTI(N, WSAVE)

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

SUBROUTINE FFTI_64(N, WSAVE)

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




C INTERFACE
#include <sunperf.h>

void rffti(int n, float *wsave);

void rffti_64(long n, float *wsave);

Description

Oracle Solaris Studio Performance Library                            rffti(3P)



NAME
       rffti  -  initialize  the  array WSAVE, which is used in both RFFTF and
       RFFTB.


SYNOPSIS
       SUBROUTINE RFFTI(N, WSAVE)

       INTEGER N
       REAL WSAVE(*)

       SUBROUTINE RFFTI_64(N, WSAVE)

       INTEGER*8 N
       REAL WSAVE(*)




   F95 INTERFACE
       SUBROUTINE FFTI(N, WSAVE)

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

       SUBROUTINE FFTI_64(N, WSAVE)

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




   C INTERFACE
       #include <sunperf.h>

       void rffti(int n, float *wsave);

       void rffti_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 (2 *  N  +  15)  or  greater.
                 RFFTI  needs  to be called only once to initialize array WORK
                 before calling RFFTF and/or  RFFTB  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                         rffti(3P)