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NAME
     dfft3b - compute a periodic sequence from its Fourier  coef-
     ficients.   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 RFFT3B (PLACE, M, N, K, SX, LDX, SY, LDY, RWSAVE,
               LWSAVE)

     SUBROUTINE DFFT3B (PLACE, M, N, K, DX, LDX, DY, LDY, DWSAVE,
               LWSAVE)



     #include <sunperf.h>

     void rfft3b (char place, int m, int n, int k, float *sx, int
               ldx, float *sy, int ldy, float *wsave, int lwsave)
               ;

     void dfft3b (char place, 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.

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

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

     xY        On entry, if the caller selected  an  out-of-place
               transform  then  xY  is  a three-dimensional array
               xY(LDY,N,K) that  contains  the  sequences  to  be
               transformed.   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    Scratch array.  The array must have been  initial-
               ized by xFFT3I.

     LWSAVE    Length of the WSAVE array.  LWSAVE >=  (M  +  N  +
               MAX(M,N,K) + 45).

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