Struct Pmo 

pub struct Pmo { /* private fields */ }

Price Momentum Oscillator — Carl Swenlin’s DecisionPoint PMO line.

PMO is a doubly-smoothed rate of change. The 1-bar percentage change is smoothed once, scaled by 10, then smoothed again:

roc_t       = (price_t / price_{t−1} − 1) · 100
smoothed_t  = customEMA(roc, smoothing1)_t
PMO_t       = customEMA(10 · smoothed, smoothing2)_t

customEMA is the DecisionPoint smoothing: an exponential average whose smoothing constant is 2 / period (not the textbook 2 / (period + 1)), seeded from the very first value. The conventional periods are 35 and 20. The classic PMO signal line is simply a 10-period EMA of this PMO line — compose it with Chain and an Ema if you need it.

Example

use wickra_core::{Indicator, Pmo};

let mut indicator = Pmo::new(35, 20).unwrap();
let mut last = None;
for i in 0..120 {
    last = indicator.update(100.0 + f64::from(i));
}
assert!(last.is_some());

Implementations

impl Pmo

pub fn new(smoothing1: usize, smoothing2: usize) -> Result<Self>

Construct a new PMO with the two smoothing periods.

Errors

Returns Error::PeriodZero if either period is 0, or Error::InvalidPeriod if either is 1 (the smoothing constant 2 / period must not exceed 1).

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

The (smoothing1, smoothing2) periods.

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

Current value if available.

Trait Implementations

impl Clone for Pmo

fn clone(&self) -> Pmo

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Pmo

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

Formats the value using the given formatter.

impl Indicator for Pmo

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.