DCL:MATH2:FFTLIB: Fast Fourier Transformation: Explanation of Subroutines
Performs sine transformation on odd cyclic data: SINTI initializes; and SINT performs sine transformation.
Forward transformation is defined as follows:
Inverse transformation is the same as the forward transformation.
CALL SINTI(N,WSAVE)
CALL SINT(N,R,WSAVE)
N (I) Length of data to process WSAVE (R) Working array. Must have a length of at least 2.5 N+15. R (R) Floating-point array to process. It is both the input and output parameter. (See above definition.)