Contents

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

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.