Struct MatchingLow 

pub struct MatchingLow { /* private fields */ }

Matching Low — a 2-bar bullish reversal. Two black candles in a decline close at the same level: the second sell-off cannot push price any lower, so the matching closes mark a support floor.

bar1, bar2 both black
equal closes  = |close2 − close1| <= 0.05 · mean(range1, range2)

Output is +1.0 when the pattern completes and 0.0 otherwise. Matching Low is a single-direction (bullish-only) reversal, so it never emits −1.0. The first bar always returns 0.0 because the two-bar window is not yet filled. The close-equality tolerance follows the geometric house style rather than TA-Lib’s rolling averages. Pattern-shape check only — no trend filter is applied; combine with a trend indicator for actionable signals.

Signed ±1 encoding

This detector emits the uniform candlestick sign convention shared across the pattern family — +1.0 bullish, 0.0 no pattern — so it drops straight into a machine-learning feature matrix as a single dimension.

Example

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

let mut indicator = MatchingLow::new();
indicator.update(Candle::new(15.0, 15.1, 9.9, 10.0, 1.0, 0).unwrap());
let out = indicator
    .update(Candle::new(13.0, 13.1, 9.9, 10.0, 1.0, 1).unwrap());
assert_eq!(out, Some(1.0));

Implementations

impl MatchingLow

pub const fn new() -> Self

Construct a new Matching Low detector.

Trait Implementations

impl Clone for MatchingLow

fn clone(&self) -> MatchingLow

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MatchingLow

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

Formats the value using the given formatter.

impl Default for MatchingLow

fn default() -> MatchingLow

Returns the “default value” for a type.

impl Indicator for MatchingLow

type Input = Candle

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, candle: Candle) -> 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.