Struct Ppo 

pub struct Ppo { /* private fields */ }

Percentage Price Oscillator — MACD expressed as a percentage.

PPO is the gap between a fast and a slow EMA, divided by the slow EMA and scaled to a percentage:

PPO = 100 · (EMA_fast − EMA_slow) / EMA_slow

Dividing by the slow EMA makes PPO scale-free: a PPO of 1.5 means “the fast EMA is 1.5 % above the slow EMA” on any instrument, so PPO readings are comparable across assets — unlike the raw price-unit MacdIndicator. The classic PPO signal line is a 9-period EMA of this PPO line; compose it with Chain and an Ema if you need it.

Example

use wickra_core::{Indicator, Ppo};

let mut indicator = Ppo::new(12, 26).unwrap();
let mut last = None;
for i in 0..80 {
    last = indicator.update(100.0 + f64::from(i));
}
assert!(last.is_some());

Implementations

impl Ppo

pub fn new(fast: usize, slow: usize) -> Result<Self>

Construct a new PPO with the fast and slow EMA periods.

Errors

Returns Error::PeriodZero if either period is 0, or Error::InvalidPeriod if fast >= slow.

pub const fn periods(&self) -> (usize, usize)

The (fast, slow) periods.

pub const fn value(&self) -> Option<f64>

Current value if available.

Trait Implementations

impl Clone for Ppo

fn clone(&self) -> Ppo

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Ppo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Indicator for Ppo

type Input = f64

Type of one input data point (typically f64 for a price, or Candle / Tick).

type Output = f64

Type of one output value.

fn update(&mut self, input: f64) -> Option<f64>

Feed one new data point into the indicator and return the freshly computed output, or None if the indicator is still warming up.

fn reset(&mut self)

Reset all internal state, leaving the indicator equivalent to a freshly constructed instance with the same parameters.

fn warmup_period(&self) -> usize

Number of inputs required before the first non-None output can be produced.

fn is_ready(&self) -> bool

Whether the indicator has emitted at least one value since the last reset.

fn name(&self) -> &'static str

Stable, human-readable indicator name. Used by chaining and diagnostics.