_FFT3DUI(3F)							  _FFT3DUI(3F)

NAME    [Toc]    [Back]

     sfft3dui, dfft3dui	- 3D FFT Real to Complex workspace initialization
     routines.

FORTRAN	SPECIFICATION
     subroutine	SFFT3DUI( n1, n2, n3, workspace	)
     integer		  n1, n2, n3
     real		  workspace(*)

     subroutine	DFFT3DUI( n1, n2, n3, workspace	)
     integer		  n1, n2, n3
     double precision	  workspace(*)

C SPECIFICATION    [Toc]    [Back]

     float     *sfft3dui( int n1, int n2, int n3,
			  float	 *workspace);

     double    *dfft3dui( int n1, int n2, int n3,
			  double *workspace);

DESCRIPTION    [Toc]    [Back]

     SFFT3DUI and DFFT3DUI initialize the array	WORKSPACE which	is used	in
     SFFT3DU and DFFT3DU. The prime factorizations of N1, N2 and N3, together
     with a tabulation of the trigonometric functions are computed and stored
     in	WORKSPACE.

     NOTE: These routines are provided only for	compatibility with previous
     releases of complib.

PARAMETERS    [Toc]    [Back]

     N1	- INTEGER.
     On	entry, N1 specifies the	number of elements in the first	dimension of
     the sequence to be	transformed.  Unchanged	on exit.

     N2	- INTEGER.
     On	entry, N2 specifies the	number of elements in the second dimension of
     the sequence to be	transformed.  Unchanged	on exit.

     N3	- INTEGER.
     On	entry, N3 specifies the	number of elements in the third	dimension of
     the sequence to be	transformed.  Unchanged	on exit.

     WORKSPACE - Array.    [Toc]    [Back]
     A work array which	must be	dimensioned at least (N1+15) + 2*(N2+15) +
     2*(N3+15).

     On	exit, WORKSPACE	will contain the prime factorizations of N1, N2	and
     N3, together with a tabulation of the trigonometric functions.





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_FFT3DUI(3F)							  _FFT3DUI(3F)

SEE ALSO    [Toc]    [Back]

     o32fft


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