Marubozu (CDLMARUBOZU)

Summary

Single candle with a long real body and no/very-short upper and lower shadows, so open and close sit at the range extremes. Bullish (white) or bearish (black) reversal/strength signal per the body color.

Formula

One candle at i. Match when: realbody(i) > BodyLong average AND upperShadow(i) < ShadowVeryShort average AND lowerShadow(i) < ShadowVeryShort average. If matched emit candlecolor(i)*100 (+100 white when close>=open, -100 black when close<open); else 0.

Notes

Despite the shape's strong-conviction reputation, Bulkowski's testing found a Marubozu continues in its expected direction only about 53% (black) to 56% (white) of the time — both "near random." (thepatternsite.com)

Inputs

inOpen — Open price of each bar
inHigh — High price of each bar
inLow — Low price of each bar
inClose — Close price of each bar

Outputs

outInteger — +100 on a white (bullish) marubozu, -100 on a black (bearish) marubozu, 0 when no pattern. Sign follows the candle color

Output Values

Value	Meaning
-100	Black marubozu — close near the low with no shadows, signaling strong selling pressure
0	No pattern
100	White marubozu — close near the high with no shadows, signaling strong buying pressure

Properties

Numerical Stability: Start-Independent


☐ Overlap Input
✅ Independent Y-Axis i
✅ Candlestick i
☐ Can Output NaN or ±Inf
☐ Identity at Period 1

Implementation

TA-Lib Definition: cdlmarubozu.c · cdlmarubozu.yaml

Native	File
C	`ta_CDLMARUBOZU.c`
Rust	`cdlmarubozu.rs`
Java	`Core_CDLMARUBOZU.java`

TA-Lib is also available for Python, R and more using a wrapper.

Aliases

Marubozu, Shaven Head/Bottom