Fix the behavior of GSL::Sf:gamma_inc and gsl mode selection for all special functions. #48
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added 3 commits
September 23, 2017 15:28
…functions. * Reduce code duplication by factoring out the mode selection code into its own function.
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This fixes a typo that caused GSL::Sf::gamma_inc to compute gamma_inc_P. Additionally, it adds a test for "natural form" variants of special functions that would have detected this issue earlier.
To make the test actually pass I had to go down the rabbit hole and fix the handling of the mode argument which was totally broken for several rb_gsl_sf_eval* functions. While at it, I refactored the mode selection code into its own function, instead of it being duplicated everywhere.