Function r_stats::gamma_quantile

pub fn gamma_quantile(
    p: f64, 
    shape: f64, 
    scale: f64, 
    lower_tail: bool, 
    log_p: bool
) -> f64

Evaluate the quantile function of the gamma distribution with shape and scale at probability p.

The shape is sometimes labelled alpha, and the scale is sometimes parameterised as (1 / lambda).

If lower_tail is true, then p is the integral from -∞ to x, else it is the integral from x to ∞. "Usual" behaviour corresponds to true.

If log_p is true, the natural logarithm of the value will be returned, with potentially higher numerical accuracy than calling .ln().