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math_audio_test_functions/functions/
step.rs

1//! Step test function
2
3use ndarray::Array1;
4
5/// Step function - discontinuous, multimodal
6/// Global minimum: f(x) = 0 at x = (0.5, 0.5, ..., 0.5)
7/// Bounds: x_i in [-100, 100]
8pub fn step(x: &Array1<f64>) -> f64 {
9    x.iter().map(|&xi| (xi + 0.5).floor().powi(2)).sum::<f64>()
10}