moxcms/matan/
monotonic.rs

1/*
2 * // Copyright (c) Radzivon Bartoshyk 6/2025. All rights reserved.
3 * //
4 * // Redistribution and use in source and binary forms, with or without modification,
5 * // are permitted provided that the following conditions are met:
6 * //
7 * // 1.  Redistributions of source code must retain the above copyright notice, this
8 * // list of conditions and the following disclaimer.
9 * //
10 * // 2.  Redistributions in binary form must reproduce the above copyright notice,
11 * // this list of conditions and the following disclaimer in the documentation
12 * // and/or other materials provided with the distribution.
13 * //
14 * // 3.  Neither the name of the copyright holder nor the names of its
15 * // contributors may be used to endorse or promote products derived from
16 * // this software without specific prior written permission.
17 * //
18 * // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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27 * // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29use crate::matan::is_curve_ascending;
30
31/// Finds out if curve is monotonic.
32pub(crate) fn is_curve_monotonic<T: PartialOrd>(lut: &[T]) -> bool {
33    if lut.len() < 2 {
34        return true;
35    }
36    let is_ascending = is_curve_ascending(lut);
37    let mut violations = 0usize;
38    if is_ascending {
39        for (current, previous) in lut.iter().skip(1).zip(lut.iter().take(lut.len() - 1)) {
40            if current.lt(previous) {
41                violations += 1;
42            }
43        }
44    } else {
45        for (current, previous) in lut.iter().skip(1).zip(lut.iter().take(lut.len() - 1)) {
46            if current.gt(previous) {
47                violations += 1;
48            }
49        }
50    }
51    (violations as f64 / lut.len() as f64) < 0.05
52}
moxcms/matan/monotonic.rs

moxcms/matan/
monotonic.rs
