argmin_math/primitives/
scaledsub.rs1use crate::{ArgminMul, ArgminScaledSub, ArgminSub};
9
10impl<T, U, W> ArgminScaledSub<T, U, W> for W
13where
14 U: ArgminMul<T, T>,
15 W: ArgminSub<T, W>,
16{
17 #[inline]
18 fn scaled_sub(&self, factor: &U, vec: &T) -> W {
19 self.sub(&factor.mul(vec))
20 }
21}
22
23#[cfg(test)]
24mod tests {
25 use super::*;
26 use approx::assert_relative_eq;
27 use paste::item;
28
29 macro_rules! make_test {
30 ($t:ty) => {
31 item! {
32 #[test]
33 fn [<test_scaledsub_ $t>]() {
34 let a = 100 as $t;
35 let b = 2 as $t;
36 let c = 29 as $t;
37 let res = <$t as ArgminScaledSub<$t, $t, $t>>::scaled_sub(&a, &b, &c);
38 assert_relative_eq!(42 as f64, res as f64, epsilon = f64::EPSILON);
39 }
40 }
41 };
42 }
43
44 make_test!(i8);
45 make_test!(u8);
46 make_test!(i16);
47 make_test!(u16);
48 make_test!(i32);
49 make_test!(u32);
50 make_test!(i64);
51 make_test!(u64);
52 make_test!(f32);
53 make_test!(f64);
54}