argmin_math/vec/
signum.rs

1// Copyright 2018-2024 argmin developers
2//
3// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
4// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
5// http://opensource.org/licenses/MIT>, at your option. This file may not be
6// copied, modified, or distributed except according to those terms.
7
8use crate::ArgminSignum;
9use num_complex::Complex;
10
11macro_rules! make_signum {
12    ($t:ty) => {
13        impl ArgminSignum for Vec<$t> {
14            fn signum(mut self) -> Self {
15                for x in &mut self {
16                    *x = x.signum();
17                }
18                self
19            }
20        }
21    };
22}
23
24macro_rules! make_signum_complex {
25    ($t:ty) => {
26        impl ArgminSignum for Vec<$t> {
27            fn signum(mut self) -> Self {
28                for x in &mut self {
29                    x.re = x.re.signum();
30                    x.im = x.im.signum();
31                }
32                self
33            }
34        }
35    };
36}
37
38make_signum!(i8);
39make_signum!(i16);
40make_signum!(i32);
41make_signum!(i64);
42make_signum!(f32);
43make_signum!(f64);
44make_signum_complex!(Complex<i8>);
45make_signum_complex!(Complex<i16>);
46make_signum_complex!(Complex<i32>);
47make_signum_complex!(Complex<i64>);
48make_signum_complex!(Complex<f32>);
49make_signum_complex!(Complex<f64>);
50
51#[cfg(test)]
52mod tests {
53    use super::*;
54    use paste::item;
55
56    macro_rules! make_test {
57        ($t:ty) => {
58            item! {
59                #[test]
60                fn [<test_signum_complex_ $t>]() {
61                    let x = vec![
62                        Complex::new(1 as $t, 2 as $t),
63                        Complex::new(4 as $t, -3 as $t),
64                        Complex::new(-8 as $t, 4 as $t),
65                        Complex::new(-8 as $t, -1 as $t),
66                    ];
67                    let y = vec![
68                        Complex::new(1 as $t, 1 as $t),
69                        Complex::new(1 as $t, -1 as $t),
70                        Complex::new(-1 as $t, 1 as $t),
71                        Complex::new(-1 as $t, -1 as $t),
72                    ];
73                    let res = <Vec<Complex<$t>> as ArgminSignum>::signum(x);
74                    for i in 0..4 {
75                        let tmp = y[i] - res[i];
76                        let norm = ((tmp.re * tmp.re + tmp.im * tmp.im) as f64).sqrt();
77                        assert!(norm < f64::EPSILON);
78                    }
79                }
80            }
81
82            item! {
83                #[test]
84                fn [<test_signum_ $t>]() {
85                    let x = vec![1 as $t, -4 as $t, 8 as $t];
86                    let y = vec![1 as $t, -1 as $t, 1 as $t];
87                    let res = <Vec<$t> as ArgminSignum>::signum(x);
88                    for i in 0..3 {
89                        let diff = (y[i] - res[i]).abs() as f64;
90                        assert!(diff < f64::EPSILON);
91                    }
92                }
93            }
94        };
95    }
96
97    make_test!(i8);
98    make_test!(i16);
99    make_test!(i32);
100    make_test!(i64);
101    make_test!(f32);
102    make_test!(f64);
103}
argmin_math/vec/signum.rs

argmin_math/vec/
signum.rs
