Function angle_rrule 

pub fn angle_rrule<R: Float>(x: Complex<R>, cotangent: R) -> Complex<R>

Reverse rule for angle.

Examples

use chainrules::angle_rrule;
use num_complex::Complex64;

assert_eq!(angle_rrule(Complex64::new(3.0, 4.0), 1.0), Complex64::new(-0.16, 0.12));