Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• ARGUMENTS

NAME

     vcffti - initialize the array WSAVE, which is used  in  both
     VCFFTF and VCFFTB.

SYNOPSIS

     SUBROUTINE VCFFTI(N, WSAVE)

     COMPLEX WSAVE(*)
     INTEGER N

     SUBROUTINE VCFFTI_64(N, WSAVE)

     COMPLEX WSAVE(*)
     INTEGER*8 N

  F95 INTERFACE
     SUBROUTINE VFFTI(N, WSAVE)

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

     SUBROUTINE VFFTI_64(N, WSAVE)

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

  C INTERFACE
     #include <sunperf.h>

     void vcffti(int n, complex *wsave);

     void vcffti_64(long n, complex *wsave);

ARGUMENTS

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

     WSAVE (input)
               On entry, an array of  dimension  (2*N  +  15)  or
               greater.   VCFFTI  needs to be called only once to
               initialize  WSAVE  before  calling  VCFFTF  and/or
               VCFFTB  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.