Function normal_pdf 

pub fn normal_pdf(x: f64) -> f64

The standard normal density $\varphi(x) = e^{-x^{2}/2}/\sqrt{2\pi}$ (its distribution function is $1 - Q(x)$, qfunc).

Examples

use comnum_math::normal_pdf;
assert!((normal_pdf(0.0) - 0.398_942_280_401_432_7).abs() < 1e-16);