Contents


NAME

     rfft2i - initialize the array WSAVE, which is used  in  both
     the forward and backward transforms.

SYNOPSIS

     SUBROUTINE RFFT2I(M, N, WORK)

     INTEGER M, N
     REAL WORK(*)

     SUBROUTINE RFFT2I_64(M, N, WORK)

     INTEGER*8 M, N
     REAL WORK(*)

  F95 INTERFACE
     SUBROUTINE FFT2I(M, N, WORK)

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

     SUBROUTINE FFT2I_64(M, N, WORK)

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

  C INTERFACE
     #include <sunperf.h>

     void rfft2i(int m, int n, float *work);

     void rfft2i_64(long m, long n, float *work);

ARGUMENTS

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

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

     WORK (input/output)
               On entry, an array of dimension (M + 2*N +  MAX(M,
               2*N)  + 30) or greater.  RFFT2I needs to be called
               only once to initialize array WORK before  calling
               RFFT2F  and/or  RFFT2B  if  M,  N  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.