math-test-functions 0.5.2

A collection of non linear functions for testing optimisation algorithms
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//! Alpine N2 test function

use ndarray::Array1;

/// Alpine N.2 function - multimodal with single global minimum
/// Global minimum on `[0, 10]^N`: each dimension is near `7.917`, with
/// 2D value approximately `-7.885`.
/// Bounds: x_i in [0, 10]
pub fn alpine_n2(x: &Array1<f64>) -> f64 {
    -x.iter()
        .map(|&xi| xi.max(0.0).sqrt() * xi.sin())
        .product::<f64>()
}