Function rgsl::gamma_beta::gamma::lngamma

pub fn lngamma(x: f64) -> f64

This routine computes the Gamma function \Gamma(x), subject to x not being a negative integer or zero. The function is computed using the real Lanczos method. The maximum value of x such that \Gamma(x) is not considered an overflow is given by the macro GSL_SF_GAMMA_XMAX and is 171.0.