MorningDojiStar

Three-bar bullish bottom reversal. A long black bar extends the decline, a doji gaps down below it (the star of indecision), then a white bar gaps back up and closes deep into the first body, confirming the turn.

Quick reference

Field	Value
Family	Candlestick Patterns
Input type	Candle
Output type	f64 — +1.0 bullish, 0.0 otherwise (never -1.0)
Output range	{0.0, +1.0}
Default parameters	penetration = 0.3 (TA-Lib default); bindings use the default
Warmup period	3 (first two bars always 0.0)
Interpretation	Confirmed bullish bottom reversal

Formula

long body = |close − open| >= 0.5 · (high − low)
doji      = |close − open| <= 0.1 · (high − low)
bar1 black & long
bar2 doji, body gaps DOWN below bar1 body     (max(o2,c2) < close1)
bar3 white, body gaps UP above the doji        (min(o3,c3) > max(o2,c2))
bar3 closes deep into bar1 body                (close3 > close1 + penetration · body1)

Bullish-only (never −1.0); the bearish mirror is EveningDojiStar. The doji variant of the classic morning star. See crates/wickra-core/src/indicators/morning_doji_star.rs.

Parameters

Name	Type	Default	Valid range	Source
penetration	f64	0.3	[0.0, 1.0)	MorningDojiStar::with_penetration (morning_doji_star.rs)

with_penetration outside [0, 1) errors (rejects_invalid_penetration, accepts_valid_penetration). Python/Node construct with the default.

Signed ±1 encoding

Single-direction shape: +1.0 bullish, 0.0 no pattern — one feature-matrix dimension.

Inputs / Outputs

use wickra::{Indicator, MorningDojiStar, Candle};
// MorningDojiStar: Input = Candle, Output = f64
const _: fn(&mut MorningDojiStar, Candle) -> Option<f64> = <MorningDojiStar as Indicator>::update;

• Always emits a value. Never None; warmup and no-match bars return 0.0.
• Node. update(open, high, low, close) → number; batch(open, high, low, close) → Array<number>.
• Python. update(candle) → float; batch(open, high, low, close) → 1-D numpy.ndarray (0.0 on warmup / no-match).

Warmup

warmup_period() == 3. The first two bars return 0.0 (first_two_bars_return_zero, accessors_and_metadata).

Edge cases

• Middle must be a doji. A real-bodied star yields 0.0 (middle_not_doji_yields_zero); for the non-doji star use MorningEveningStar.
• Close must penetrate the first body. A shallow third close yields 0.0 (shallow_close_yields_zero).
• Reset. reset() clears the two-bar cache (reset_clears_state).

Examples

Rust

use wickra::{Candle, Indicator, MorningDojiStar};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut t = MorningDojiStar::new();
    println!("{:?}", t.update(Candle::new(15.0, 15.1, 9.9, 10.0, 1.0, 0)?)); // long black
    println!("{:?}", t.update(Candle::new(8.0, 8.1, 7.9, 8.0, 1.0, 1)?));    // doji, gaps down
    println!("{:?}", t.update(Candle::new(9.0, 13.1, 8.9, 13.0, 1.0, 2)?));  // white, deep close
    Ok(())
}

Output:

Some(0.0)
Some(0.0)
Some(1.0)

The doji gaps below the black close (10), and the white bar closes at 13.0 — deep into the black body — a morning doji star. This matches morning_doji_star_is_plus_one.

Python

import numpy as np
import wickra as ta

o = np.array([15.0, 8.0, 9.0])
h = np.array([15.1, 8.1, 13.1])
l = np.array([9.9,  7.9, 8.9])
c = np.array([10.0, 8.0, 13.0])

print(ta.MorningDojiStar().batch(o, h, l, c))  # [0. 0. 1.]

Node

const ta = require('wickra');
const t = new ta.MorningDojiStar();
t.update(15, 15.1, 9.9, 10);
t.update(8, 8.1, 7.9, 8);
console.log(t.update(9, 13.1, 8.9, 13)); // 1

Streaming

use wickra::{Candle, Indicator, MorningDojiStar};

let mut t = MorningDojiStar::new();
let candle_stream: Vec<wickra::Candle> = Vec::new(); // your live OHLCV candle feed
for bar in candle_stream {
    if t.update(bar) == Some(1.0) { /* confirmed bullish bottom */ }
}

Interpretation

1. Confirmed bottom. The deep-closing white third bar confirms the reversal — a strong bullish signal at the foot of a decline.
2. Penetration depth. A deeper third close (raise penetration) demands a more decisive reversal and filters weaker setups.
3. Best at support. Strongest after an extended decline or into support.

Common pitfalls

• Shallow third close. A third bar that barely lifts into the first body does not qualify at the default 30 % penetration.
• 24/7 markets. Uses body gaps (not full gaps), so it fires more readily than AbandonedBaby on gapless feeds.

References

• Steve Nison, Japanese Candlestick Charting Techniques (1991).

See also

• EveningDojiStar — the bearish mirror.
• MorningEveningStar — the non-doji star pair.
• DojiStar — the two-bar precursor.
• Indicators-Overview — the full taxonomy.