vdffti (3p)

Name

vdffti - initialize the array WSAVE, which is used in both VRFFTF and VRFFTB.

Synopsis

SUBROUTINE VDFFTI(N, WSAVE)

INTEGER N
DOUBLE PRECISION WSAVE(*)

SUBROUTINE VDFFTI_64(N, WSAVE)

INTEGER*8 N
DOUBLE PRECISION WSAVE(*)




F95 INTERFACE
SUBROUTINE VFFTI(N, WSAVE)

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

SUBROUTINE VFFTI_64(N, WSAVE)

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




C INTERFACE
#include <sunperf.h>

void vdffti(int n, double *wsave);

void vdffti_64(long n, double *wsave);

Description

Oracle Solaris Studio Performance Library                           vdffti(3P)



NAME
       vdffti  -  initialize the array WSAVE, which is used in both VRFFTF and
       VRFFTB.


SYNOPSIS
       SUBROUTINE VDFFTI(N, WSAVE)

       INTEGER N
       DOUBLE PRECISION WSAVE(*)

       SUBROUTINE VDFFTI_64(N, WSAVE)

       INTEGER*8 N
       DOUBLE PRECISION WSAVE(*)




   F95 INTERFACE
       SUBROUTINE VFFTI(N, WSAVE)

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

       SUBROUTINE VFFTI_64(N, WSAVE)

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




   C INTERFACE
       #include <sunperf.h>

       void vdffti(int n, double *wsave);

       void vdffti_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 (N + 15) or greater.   VRFFTI
                 needs to be called only once to initialize WSAVE before call-
                 ing VRFFTF and/or VRFFTB 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                        vdffti(3P)