cospi_rrule

chainrules

Function cospi_rrule 

Source 
pub fn cospi_rrule<S: ScalarAd>(x: S, cotangent: S) -> S
Expand description

Reverse rule for cospi.

ยงExamples

use chainrules::cospi_rrule;

let dy = cospi_rrule(0.25_f64, 1.0);
assert!((dy + std::f64::consts::PI * (std::f64::consts::PI * 0.25_f64).sin()).abs() < 1e-12);