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NAME
     dfft3f - compute the Fourier coefficients of a real periodic
     sequence.   The  xFFT operations are unnormalized, so a call
     of xFFT3F followed by a call of  xFFT3B  will  multiply  the
     input sequence by M*N*K.

SYNOPSIS
     SUBROUTINE RFFT3F (PLACE, FULL, M, N, K, SX, LDX,  SY,  LDY,
               RWSAVE, LWSAVE)

     SUBROUTINE DFFT3F (PLACE, FULL, M, N, K, DX, LDX,  DY,  LDY,
               DWSAVE, LWSAVE)



     #include <sunperf.h>

     void rfft3f (char place, char full, int m,  int  n,  int  k,
               float  *sx,  int  ldx,  float  *sy, int ldy, float
               *wsave, int lwsave) ;

     void dfft3f (char place, char full, int m,  int  n,  int  k,
               double  *dx,  int ldx, double *dy, int ldy, double
               *wsave, int lwsave) ;

ARGUMENTS
     PLACE     Select an in-place ('I' or  'i')  or  out-of-place
               ('O' or 'o') transform.

     FULL      Select a full  ('F'  or  'f')  or  partial  ('  ')
               representation  of  the  results.   If  the caller
               selects full representation  then  an  MxNxK  real
               array  will  transform to produce an MxNxK complex
               array.   If  the  caller  does  not  select   full
               representation  then  an  MxNxK  real  array  will
               transform to  a  (M/2+1)xNxK  complex  array  that
               takes  advantage  of  the symmetry properties of a
               transformed real sequence.

     M         Number of rows to be transformed.   These  subrou-
               tines  are  most  efficient when M is a product of
               small primes.  M >= 0.

     N         Number of columns to be transformed.   These  sub-
               routines are most efficient when N is a product of
               small primes.  N >= 0.

     K         Number of planes to be transformed.  These subrou-
               tines  are  most  efficient when K is a product of
               small primes.  K >= 0.

     xX        On entry, a  three-dimensional  array  xX(LDX,N,K)
               that contains the sequences to be transformed.  On
               exit, the  transformed  sequences  if  the  caller
               selected an in-place transform.

     LDX       Leading dimension of the array containing the data
               to be transformed.  LDX >= M.

     xY        On  exit,  xY(LDY,N,K)  contains  the  transformed
               sequences  if  the caller selected an out of place
               transform.  If the  caller  selected  an  in-place
               transform then this argument is never referenced.

     LDY       Leading dimension of the array for an out-of-place
               transform.  LDY >= M.

     xWSAVE    On entry, an array with dimension of at least (M +
               N  +  MAX(M,N,K)  + 45).  The array must have been
               initialized by xFFT3I.

     LWSAVE    Length of the xWSAVE array.

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