Best stats library for C (not C++) [closed]

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Anyone know of a good statistics library for C? I'm looking for something that is commonly used and not a small project. EDIT: must be free!

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gsl (http://www.gnu.org/software/gsl/) is widely available, portable, and has a lot of nice functionality.

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Statistics are frequently done in other languages, but some of those languages will be callable from C. I'd recommend looking at R and Octave; the latter is an open source Matlab work-alike. Both are programming languages in their own right, but many other languages can be called from C.

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In my opinion, MATLAB is a very good choice you can use for that. Here is an article on how to call MATLAB from C.

It ain't cheap. But you did not specify anything about the library being cheap or free. Plus, you are mentioning it's a big project.... :-)