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use crate::sliding_window::View;
use crate::{Echo, WelfordOnline};
#[derive(Clone)]
pub struct VST {
view: Box<dyn View>,
last: f64,
welford_online: WelfordOnline,
}
impl VST {
pub fn new(view: Box<dyn View>) -> Self {
Self {
view,
last: 0.0,
welford_online: WelfordOnline::new_final(),
}
}
pub fn new_final() -> Self {
Self::new(Box::new(Echo::new()))
}
}
impl View for VST {
fn update(&mut self, val: f64) {
self.view.update(val);
let view_last: f64 = self.view.last();
self.welford_online.update(view_last);
self.last = view_last;
}
fn last(&self) -> f64 {
let std_dev = self.welford_online.last();
if std_dev == 0.0 {
return 0.0;
}
self.last / std_dev
}
}