math-test-functions 0.5.2

A collection of non linear functions for testing optimisation algorithms
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

//! Mishras Bird Constraint test function

use ndarray::Array1;

/// Mishra's Bird constraint: (x+5)^2 + (y+5)^2 < 25
pub fn mishras_bird_constraint(x: &Array1<f64>) -> f64 {
    (x[0] + 5.0).powi(2) + (x[1] + 5.0).powi(2) - 25.0
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn center_of_disk_satisfies_constraint() {
        let x = Array1::from(vec![-5.0, -5.0]);
        assert!(mishras_bird_constraint(&x) < 0.0);
    }

    #[test]
    fn outside_disk_violates_constraint() {
        let x = Array1::from(vec![1.0, 1.0]);
        assert!(mishras_bird_constraint(&x) > 0.0);
    }
}