math-test-functions 0.5.2

A collection of non linear functions for testing optimisation algorithms
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//! Rotated Hyper Ellipsoid test function

use ndarray::Array1;

/// Rotated hyper-ellipsoid function - unimodal, non-separable
/// Global minimum: f(x) = 0 at x = (0, 0, ..., 0)
/// Bounds: x_i in [-65.536, 65.536]
pub fn rotated_hyper_ellipsoid(x: &Array1<f64>) -> f64 {
    (0..x.len())
        .map(|i| x.iter().take(i + 1).map(|&xi| xi.powi(2)).sum::<f64>())
        .sum::<f64>()
}