ppo

// Percentage Price Oscillator
// Defaults of "ppo" (see the indicator reference)
let params = HashMap::from([
    ("fast_period".to_string(), 12.0),
    ("signal_period".to_string(), 9.0),
    ("slow_period".to_string(), 26.0),
]);
let mut indicator = build_checked("ppo", &params)?;

for bar in &bars {
    if let Some(output) = indicator.on_bar(bar) {
        // output.value, output.extra[...], indicator.alerts()
    }
}