_FFT3DUI(3F)_FFT3DUI(3F)NAME
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
float *sfft3dui( int n1, int n2, int n3,
float *workspace);
double *dfft3dui( int n1, int n2, int n3,
double *workspace);
DESCRIPTION
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
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.
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
o32fft
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