pub fn powf_frule<S: ScalarAd>(x: S, exponent: S::Real, dx: S) -> (S, S)Expand description
Forward rule for powf with fixed exponent. Returns (primal, tangent).
use chainrules::powf_frule;
let (y, dy) = powf_frule(2.0_f64, 3.0, 1.0);
assert_eq!(y, 8.0);
assert_eq!(dy, 12.0);