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math_audio_test_functions/functions/
drop_wave.rs

1//! Drop Wave test function
2
3use ndarray::Array1;
4
5/// Drop wave function - 2D multimodal
6/// Global minimum: f(x) = -1.0 at x = (0, 0)
7/// Bounds: x_i in [-5.12, 5.12]
8pub fn drop_wave(x: &Array1<f64>) -> f64 {
9    let x1 = x[0];
10    let x2 = x[1];
11    let numerator = 1.0 + (12.0 * (x1.powi(2) + x2.powi(2)).sqrt()).cos();
12    let denominator = 0.5 * (x1.powi(2) + x2.powi(2)) + 2.0;
13    -numerator / denominator
14}