5.4.7. Gamma function (gamma, gamma_r)

double gamma(double x);
double gamma_r(double x, int *);

These functions both compute the logarithm of the gamma function. They are synonyms for lgamma and lgamma_r (see The logarithm of the gamma function (lgamma, lgamma_r)).

Note

Despite their names, these functions compute the logarithm of the gamma function, not the gamma function itself.

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