8cb1a96ede
Taken from: https://github.com/freebsd/freebsd-ports.git Commit id: 5070672073b68be364139bc6b3a89100bd17d331
22 lines
965 B
Text
22 lines
965 B
Text
The Math::FFT module provides an interface to various Fast Fourier
|
|
Transform (FFT) routines of the C routine of fft4g.c; The one-dimensional
|
|
data sets, of size 2^n, are assumed to be sampled at a constant
|
|
rate.
|
|
|
|
The FFT methods available are
|
|
- cdft: Complex Discrete Fourier Transform
|
|
- rdft: Real Discrete Fourier Transform
|
|
- ddct: Discrete Cosine Transform
|
|
- ddst: Discrete Sine Transform
|
|
- dfct: Cosine Transform of RDFT (Real Symmetric DFT)
|
|
- dfst: Sine Transform of RDFT (Real Symmetric DFT)
|
|
as well as their inverses.
|
|
|
|
The C code for the FFT routines of fft4g.c is copyrighted 1996-99
|
|
by Takuya OOURA. The file arrays.c included here to handle passing
|
|
arrays to and from C comes from the PGPLOT module of Karl Glazebrook
|
|
<kgb@aaoepp.aao.gov.au>. The perl interface of the Math::FTT module
|
|
is Copyright 2000 by Randy Kobes <randy@theoryx5.uwinnipeg.ca>,
|
|
and may be distributed under the same terms as Perl itself.
|
|
|
|
WWW: http://search.cpan.org/dist/Math-FFT/
|