Struct Zlema 

pub struct Zlema { /* private fields */ }

Zero-Lag Exponential Moving Average (Ehlers & Way).

A standard EMA applied to a de-lagged price series. The de-lagged input is 2·price_t − price_{t−lag} with lag = (period − 1) / 2; adding that momentum term to the current price cancels most of the EMA’s group delay, so the average tracks turns far more tightly than a plain Ema.

The first output lands after exactly lag + period inputs: lag inputs are needed before the de-lagged series is defined, then period de-lagged values seed the inner EMA.

Example

use wickra_core::{Indicator, Zlema};

let mut indicator = Zlema::new(10).unwrap();
let mut last = None;
for i in 0..80 {
    last = indicator.update(100.0 + f64::from(i));
}
assert!(last.is_some());

Implementations

impl Zlema

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

Construct a new ZLEMA with the given period.

Errors

Returns Error::PeriodZero if period == 0.

pub const fn period(&self) -> usize

Configured period.

pub const fn lag(&self) -> usize

Lag offset (period − 1) / 2 used to de-lag the price series.

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

Current value if available.

Trait Implementations

impl Clone for Zlema

fn clone(&self) -> Zlema

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Zlema

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

Formats the value using the given formatter.

impl Indicator for Zlema

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.