math-test-functions 0.5.2

A collection of non linear functions for testing optimisation algorithms
Documentation 
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//! Bohachevsky2 test function

use ndarray::Array1;

/// Bohachevsky function 2 - 2D multimodal
/// Global minimum: f(x) = 0 at x = (0, 0)
/// Bounds: x_i in [-100, 100]
pub fn bohachevsky2(x: &Array1<f64>) -> f64 {
    let x1 = x[0];
    let x2 = x[1];
    x1.powi(2) + 2.0 * x2.powi(2)
        - 0.3 * (3.0 * std::f64::consts::PI * x1).cos() * (4.0 * std::f64::consts::PI * x2).cos()
        + 0.3
}