Ladder Bottom (CDLLADDERBOTTOM)

Summary

Five-candle bullish reversal pattern: three consecutively lower black candles, a fourth black candle with a non-very-short upper shadow, then a white candle that opens above the prior open and closes above the prior high. A hit is a bullish reversal signal, most meaningful after a downtrend.

Chart

Reference data (CSV) · Chart (SVG)

Chart metadata i

Outputs

outInteger: pattern_bull_bear · zero · positive

Notes

Does not verify the preceding downtrend that this bullish reversal classically assumes.
Bulkowski's testing found this reverses a downtrend only 56% of the time ("near random"), ranking 41st of 103 patterns for overall performance. (thepatternsite.com)
Rare: a few years of one symbol's daily bars may show none. Bulkowski ranks it 80th of 103 patterns by how often it occurs (Ladder Bottom), and it fires 3 times in about 16,000 daily crypto bars.

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 detected ladder bottom, 0 otherwise. Only ever emits +100 (never -100); inherently bullish

Output Values

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

Value	Meaning
0	No pattern
100	Ladder Bottom detected — a bullish reversal signal, most meaningful after a downtrend (unverified by the function)

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_CDLLADDERBOTTOM( 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.cdlladderbottom(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.cdlladderbottom(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.Cdlladderbottom(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 { cdlladderbottom } 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 } = cdlladderbottom({ 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: cdlladderbottom.c · cdlladderbottom.yaml

Native	File
C	`ta_CDLLADDERBOTTOM.c`
Rust	`cdlladderbottom.rs`
Java	`Core_CDLLADDERBOTTOM.java`
C#	`Core_CDLLADDERBOTTOM.cs`
TypeScript	`cdlladderbottom.ts`

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

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

Aliases

Ladder Bottom