sfft2dui,dfft2dui(3F) sfft2dui,dfft2dui(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
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