Tell me what to choose a library for the fast Fourier transform? Found
FFTW but it has not been updated for 4 years. Subject to what is an
alternative?. I am interested in the transformation of 1D, forward and
reverse. On the official FFTW website examples by c++ programming
language 
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Why do you need a more recent version? I had a quick look, and the only
"recent" changes I saw within FFTW were updates to the license. Perhaps
it works fine, so doesn't need updates. Have you tried it?
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Be sure to try, the only thing I do not understand the syntax for Ruby.
Example of code that I need on the official site FFTW.
#include <fftw3.h>
...
{
fftw_complex *in, *out;
fftw_plan p;
...
in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N);
out = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N);
p = fftw_plan_dft_1d(N, in, out, FFTW_FORWARD, FFTW_ESTIMATE);
...
fftw_execute(p); /* repeat as needed */
...
fftw_destroy_plan(p);
fftw_free(in); fftw_free(out);
}
How would it look to Ruby?.
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There are a few examples in Ruby of using FFTW3 here:
http://ruby.gfd-dennou.org/products/ruby-fftw3/doc/ruby-fftw3.html
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