Function rgsl::gamma_beta::pochhammer_symbol::poch_e

pub fn poch_e(a: f64, x: f64) -> (Value, Result)

This routine computes the Pochhammer symbol (a)_x = \Gamma(a + x)/\Gamma(a). The Pochhammer symbol is also known as the Apell symbol and sometimes written as (a,x). When a and a+x are negative integers or zero, the limiting value of the ratio is returned.