Up/Down-gap side-by-side white lines (CDLGAPSIDESIDEWHITE)

Summary

A three-candle pattern: a first candle followed by two white candles of similar body size that both gap the same direction (up or down) from the first candle's real body and open at about the same level. It is a continuation signal whose sign reports the gap direction; the code does not verify a prior trend.

Notes

Does not verify the prior trend the continuation signal classically assumes.
Bulkowski's data shows the bullish form is rare (984 occurrences out of 4.7 million candle lines, frequency rank 73/103) but continues as labeled 66% of the time; the bearish form is rarer still (frequency rank 86/103) and its 56% continuation rate is "near random" — Bulkowski cautions the bearish sample is too thin to trust. (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 for an up-gap (bullish continuation), -100 for a down-gap (bearish continuation), 0 when no pattern. Sign is set solely by the C2-vs-C1 gap direction (realbodygapup ? 100 : -100)

Output Values

Value	Meaning
-100	Bearish continuation: two similar white candles gapped down together and held the gap, suggesting the decline will resume
0	No pattern
100	Bullish continuation: two similar white candles gapped up together and held the gap, suggesting the advance will resume

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: cdlgapsidesidewhite.c · cdlgapsidesidewhite.yaml

Native	File
C	`ta_CDLGAPSIDESIDEWHITE.c`
Rust	`cdlgapsidesidewhite.rs`
Java	`Core_CDLGAPSIDESIDEWHITE.java`

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

Aliases

Up/Down-gap side-by-side white lines, Gapping side-by-side white lines