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use std::collections::VecDeque;
use crate::{Echo, View, EMA};
#[derive(Clone)]
pub struct PolarizedFractalEfficiency {
view: Box<dyn View>,
moving_average: Box<dyn View>,
window_len: usize,
q_vals: VecDeque<f64>,
out: f64,
}
impl PolarizedFractalEfficiency {
pub fn new(view: Box<dyn View>, window_len: usize) -> Box<Self> {
Self::with_ma(view, EMA::new_final(window_len), window_len)
}
pub fn new_final(window_len: usize) -> Box<Self> {
Self::new(Echo::new(), window_len)
}
pub fn with_ma(
view: Box<dyn View>,
moving_average: Box<dyn View>,
window_len: usize,
) -> Box<Self> {
Box::new(Self {
view,
moving_average,
window_len,
q_vals: VecDeque::new(),
out: 0.0,
})
}
}
impl View for PolarizedFractalEfficiency {
fn update(&mut self, val: f64) {
self.view.update(val);
let val: f64 = self.view.last();
if self.q_vals.len() >= self.window_len {
self.q_vals.pop_front();
}
self.q_vals.push_back(val);
if self.q_vals.len() < self.window_len {
self.out = 0.0;
} else {
let mut s: f64 = 0.0;
let wl: usize = self.window_len - 1;
for i in 0..self.window_len - 2 {
let v_0: f64 = *self.q_vals.get(wl - i).unwrap();
let v_1: f64 = *self.q_vals.get(wl - i - 1).unwrap();
s += ((v_0 - v_1).powi(2) + 1.0).sqrt();
}
let mut p: f64 = ((val - self.q_vals.front().unwrap()).powi(2)
+ (self.window_len as f64).powi(2))
.sqrt()
/ s;
if val < *self.q_vals.get(self.window_len - 2).unwrap() {
p = -p;
}
self.moving_average.update(p);
self.out = self.moving_average.last();
}
}
fn last(&self) -> f64 {
self.out
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::plot::plot_values;
use crate::test_data::TEST_DATA;
#[test]
fn polarized_fractal_efficiency() {
let mut pfe = PolarizedFractalEfficiency::new_final(16);
for v in &TEST_DATA {
pfe.update(*v);
assert!(pfe.last() <= 1.0);
assert!(pfe.last() >= -1.0);
}
}
#[test]
fn polarized_fractal_efficiency_plot() {
let mut pfe = PolarizedFractalEfficiency::new_final(16);
let mut out: Vec<f64> = vec![];
for v in &TEST_DATA {
pfe.update(*v);
out.push(pfe.last());
}
let filename = "img/polarized_fractal_efficiency.png";
plot_values(out, filename).unwrap();
}
}