Function r_mathlib::normal_pdf

pub fn normal_pdf(x: f64, mu: f64, sigma: f64, give_log: bool) -> f64

Evaluate the probability density function of the normal distribution with mean mu and variance sigma² at x.

The formula for this function is $\frac{1}{\sigma \sqrt{\mathrm{2\pi }}}{\mathrm{e}}^{-\frac{1}{2}\left(\frac{x-\mathrm{\mu }}{\mathrm{\sigma }}\right)}$ where μ is the mean, and σ² is the variance.

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