Struct ElderSafeZone 

pub struct ElderSafeZone { /* private fields */ }

Elder SafeZone Stop — Alexander Elder’s stop placed a multiple of the average market noise away from price.

long  market noise = average downside penetration = mean( prev_low − low | low < prev_low )
short market noise = average upside  penetration = mean( high − prev_high | high > prev_high )
long  stop = ratchet_up(   low_t  − coeff · avg_down_penetration )
short stop = ratchet_down( high_t + coeff · avg_up_penetration   )

Elder defines noise in an uptrend as the part of each bar that pokes below the previous bar’s low (a “downside penetration”). Averaging those penetrations over a lookback and placing the stop coeff multiples below the current low keeps the stop just outside normal pullbacks while still exiting on a genuine reversal. The stop trails in the trend’s favour and flips when price closes through it. The average uses only the bars that actually penetrated (Elder’s definition), so a noiseless trend gives a tight stop at the bar’s extreme.

The first bar seeds the prior candle; the next period bars accumulate the penetration statistics, so the first stop lands after period + 1 inputs. Each update is O(1).

Example

use wickra_core::{Candle, Indicator, ElderSafeZone};

let mut indicator = ElderSafeZone::new(14, 2.0).unwrap();
let mut last = None;
for i in 0..60 {
    let base = 100.0 + f64::from(i);
    let c = Candle::new(base, base + 2.0, base - 2.0, base + 1.0, 1_000.0, 0).unwrap();
    last = indicator.update(c);
}
assert!(last.is_some());

Implementations

impl ElderSafeZone

pub fn new(period: usize, coeff: f64) -> Result<Self>

Construct an Elder SafeZone stop with the given averaging period and noise coefficient.

Errors

Returns Error::PeriodZero if period == 0 and Error::NonPositiveMultiplier if coeff is not finite and positive.

pub const fn params(&self) -> (usize, f64)

Configured (period, coeff).

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

Current value if available.

Trait Implementations

impl Clone for ElderSafeZone

fn clone(&self) -> ElderSafeZone

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ElderSafeZone

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

Formats the value using the given formatter.

impl Indicator for ElderSafeZone

type Input = Candle

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

type Output = ElderSafeZoneOutput

Type of one output value.

fn update(&mut self, candle: Candle) -> Option<ElderSafeZoneOutput>

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.