sdfft2dui(3F)

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

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


DESCRIPTION
     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
     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.
     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
     o32fft