Struct Dpo 

pub struct Dpo { /* private fields */ }

Detrended Price Oscillator — strips the trend out of price to expose its shorter cycles.

Instead of comparing price to a current moving average, DPO compares a past price — shifted back by period / 2 + 1 bars — to the moving average of the window:

shift = period / 2 + 1
DPO_t = price_{t − shift} − SMA(period)_t

Because the price is taken from roughly half a cycle back, the dominant trend cancels out and what remains oscillates around zero — making the peak-to-peak cycle length easy to read. DPO is not a momentum indicator and is not meant to track the latest bar.

Example

use wickra_core::{Indicator, Dpo};

let mut indicator = Dpo::new(20).unwrap();
let mut last = None;
for i in 0..80 {
    last = indicator.update(100.0 + (f64::from(i) * 0.3).sin() * 10.0);
}
assert!(last.is_some());

Implementations

impl Dpo

pub fn new(period: usize) -> Result<Self>

Construct a new DPO with the given period.

Errors

Returns Error::PeriodZero if period == 0.

pub const fn period(&self) -> usize

Configured period.

pub const fn shift(&self) -> usize

The look-back shift period / 2 + 1.

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

Current value if available.

Trait Implementations

impl Clone for Dpo

fn clone(&self) -> Dpo

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Dpo

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

Formats the value using the given formatter.

impl Indicator for Dpo

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.