Belt-hold (CDLBELTHOLD)

Summary

Single-candle pattern with a long real body that opens at (or near) its extreme. A bullish belt-hold is a long white candle with no/very short lower shadow; a bearish belt-hold is a long black candle with no/very short upper shadow. A white hit is bullish (opens at the low, closes strong); a black hit is bearish (opens at the high, closes weak).

Chart

Reference data (CSV) · Chart (SVG)

Chart metadata i

Outputs

outInteger: pattern_bull_bear · zero · positive · negative

Formula

One candle. Requires real body > BodyLong average (long body), then either: white body (close>=open) AND lower shadow < ShadowVeryShort average -> bullish; OR black body (close<open) AND upper shadow < ShadowVeryShort average -> bearish. No prior-trend or gap conditions are checked.

Notes

Does not verify the prior trend that the pattern's bullish/bearish reading classically assumes.
Bulkowski's testing ranks the bullish Belt-Hold's 71% reversal rate 11th of 103 patterns for pure reversal reliability (bearish reverses 68% of the time) — though its overall post-breakout performance rank is a more middling 62nd/63rd of 103. (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 a bullish (white) belt-hold, -100 for a bearish (black) belt-hold, 0 otherwise

Output Values

What candlestick values mean: Candlestick Outputs. The function's flags declare which values it can return: rW7.

Value	Meaning
-100	Bearish belt-hold — opens at (or near) the high and sells off hard into the close, showing strong seller conviction
0	No pattern
100	Bullish belt-hold — opens at (or near) the low and rallies hard into the close, showing strong buyer conviction

Properties

Numerical Stability: Start-Independent


☐ Overlap Input
✅ Independent Y-Axis i
✅ Candlestick i
☐ Display Shift


☐ Can Output NaN or ±Inf
☐ Identity at Period 1
☐ Uses Transcendental
☐ Input Must Be Positive

Example

#include <stdio.h>
#include <ta_libc.h>

int n = 252;
double open[252]; /* your data, oldest first */
double high[252]; /* your data, oldest first */
double low[252]; /* your data, oldest first */
double close[252]; /* your data, oldest first */
int out[252];
int outBegIdx, outNBElement;

TA_Initialize();
TA_CDLBELTHOLD( 0, n - 1, open, high, low, close, &outBegIdx, &outNBElement, out );
printf( "%d values from bar %d; last out = %d\n", outNBElement, outBegIdx, out[outNBElement - 1] );

Rust

use ta_lib::Core;

let open = vec![0.0; 252]; // your data, oldest first
let high = vec![0.0; 252]; // your data, oldest first
let low = vec![0.0; 252]; // your data, oldest first
let close = vec![0.0; 252]; // your data, oldest first
let mut out = vec![0i32; 252];

let core = Core::new();
let range = core.cdlbelthold(0, open.len() - 1, &open, &high, &low, &close, &mut out)?;
println!("{} values from bar {}; last out = {}", range.count, range.beg_idx, out[range.count - 1]);

Java

import io.github.talib.Core;
import io.github.talib.OutRange;

double[] open = new double[252]; // your data, oldest first
double[] high = new double[252]; // your data, oldest first
double[] low = new double[252]; // your data, oldest first
double[] close = new double[252]; // your data, oldest first
int[] out = new int[252];

Core core = Core.DEFAULT;
OutRange r = core.cdlbelthold(0, open.length - 1, open, high, low, close, out);
System.out.println(r.count() + " values from bar " + r.begIdx() + "; last out = " + out[r.count() - 1]);

using System;
using TALib;

var open = new double[252]; // your data, oldest first
var high = new double[252]; // your data, oldest first
var low = new double[252]; // your data, oldest first
var close = new double[252]; // your data, oldest first
var outInteger = new int[252];

var core = Core.Default;
OutRange r = core.Cdlbelthold(0, open.Length - 1, open, high, low, close, outInteger);
Console.WriteLine($"{r.Count} values from bar {r.BegIdx}; last outInteger = {outInteger[r.Count - 1]}");

TypeScript

import { cdlbelthold } from 'ta-lib';

const open = new Float64Array(252); // your data, oldest first
const high = new Float64Array(252); // your data, oldest first
const low = new Float64Array(252); // your data, oldest first
const close = new Float64Array(252); // your data, oldest first

const { begIdx, values } = cdlbelthold({ open, high, low, close });
console.log(values.length + ' values from bar ' + begIdx + '; last values = ' + values[values.length - 1]);

Implementation

Added in 0.4.0.

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

Native	File
C	`ta_CDLBELTHOLD.c`
Rust	`cdlbelthold.rs`
Java	`Core_CDLBELTHOLD.java`
C#	`Core_CDLBELTHOLD.cs`
TypeScript	`cdlbelthold.ts`

Python: talib.CDLBELTHOLD, see ta-lib-python.

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

Aliases

Belt-hold, Belt Hold Line