c++ - gamma or log gamma function in C or C -

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i seeking c or c++ version of gamma , log gamma functions.

are there code pieces or libraries recommended?

if possible, want know principle of implementations.

thank you!!!

if can't use c++11: gnu gsl has gamma function ever need: http://www.gnu.org/software/gsl/manual/html_node/gamma-functions.html#index-gsl_005fsf_005flngamma-583

or can have @ boost's math special functions: http://www.boost.org/doc/libs/1_53_0/libs/math/doc/sf_and_dist/html/math_toolkit/special/sf_gamma/lgamma.html


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