Contents

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

NAME

     rfft3i - initialize the array WSAVE, which is used  in  both
     RFFT3F and RFFT3B.

SYNOPSIS

     SUBROUTINE RFFT3I(M, N, K, WORK)

     INTEGER M, N, K
     REAL WORK(*)

     SUBROUTINE RFFT3I_64(M, N, K, WORK)

     INTEGER*8 M, N, K
     REAL WORK(*)

  F95 INTERFACE
     SUBROUTINE FFT3I(M, N, K, WORK)

     INTEGER :: M, N, K
     REAL, DIMENSION(:) :: WORK

     SUBROUTINE FFT3I_64(M, N, K, WORK)

     INTEGER(8) :: M, N, K
     REAL, DIMENSION(:) :: WORK

  C INTERFACE
     #include <sunperf.h>

     void rfft3i(int m, int n, int k, float *work);

     void rfft3i_64(long m, long n, long k, float *work);

ARGUMENTS

     M (input) Number of rows to be transformed.  M >= 0.

     N (input) Number of columns to be transformed.  N >= 0.

     K (input) Number of planes to be transformed.  K >= 0.

     WORK (input/output)
               On entry, an array of dimension (M + 2*(N +  K)  +
               4*K  +  45) or greater.  RFFT3I needs to be called
               only once to initialize array WORK before  calling
               RFFT3F  and/or  RFFT3B  if M, N, K and WORK 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.