sfft2dui,dfft2dui(3F)					 sfft2dui,dfft2dui(3F)

NAME    [Toc]    [Back]

     sfft2dui, dfft2dui	- 2D FFT Real to Complex workspace initialization
     routines.

FORTRAN	SPECIFICATION
     subroutine	SFFT2DUI( n1, n2, workspace )
     integer		  n1, n2
     real		  workspace(*)

     subroutine	DFFT2DUI( n1, n2, workspace )
     integer		  n1, n2
     double precision	  workspace(*)

C SPECIFICATION    [Toc]    [Back]

     float     *sfft2dui( int n1, int n2, float	 *workspace)

     double    *dfft2dui( int n1, int n2, double *workspace)

DESCRIPTION    [Toc]    [Back]

     SFFT2DUI and DFFT2DUI initialize the array	WORKSPACE which	is used	in
     SFFT2DU and DFFT2DU. The prime factorizations of N1 and N2, 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.

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

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

SEE ALSO    [Toc]    [Back]

     o32fft


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