Function find_nearest

crates/openquant/src/microstructural_features.rs:480–491

(enc: &[(f64, char)], value: f64)

}

fn find_nearest(enc: &[(f64, char)], value: f64) -> Option<char> {
    let mut best = None;
    let mut dist = f64::INFINITY;
    for (k, c) in enc {
        let d = (k - value).abs();
        if d < dist {
            dist = d;
            best = Some(*c);
        }
    }
    best
}

pub fn encode_array(array: &[f64], encoding: &[(f64, char)]) -> String {
    let mut s = String::new();