Dragonfly Doji (CDLDRAGONFLYDOJI)

Summary

Single-candle pattern: a doji (open and close nearly equal) sitting at the top of the range, with no meaningful upper shadow and a long lower shadow. A reversal signal, but its bullish/bearish meaning depends on the prior trend (the code does not judge direction). A hit marks a dragonfly doji; treated as a potential reversal, but direction (bullish/bearish) must be read from the trend it appears in.

Chart

Reference data (CSV) · Chart (SVG)

Chart metadata i

Outputs

outInteger: pattern_bool · zero · positive

Formula

Single candle. realbody <= BodyDoji average (doji body) AND upper shadow < ShadowVeryShort average (no/very short upper shadow) AND lower shadow > ShadowVeryShort average (lower shadow present, not very short). No color, gap, or trend test.

Notes

Does not verify the prior trend that determines the pattern's bullish/bearish meaning.
Bulkowski's testing found this reverses the prior trend only about 50% of the time — statistically no better than a coin flip — and ranks 98th of 103 candlestick patterns for post-breakout performance. (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 when the pattern is present, 0 otherwise; never -100. The +100 does not itself imply bullishness (must be read against the trend)

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	Dragonfly Doji detected — a potential reversal; direction (bullish/bearish) must be read from the prevailing trend, which this function does not check

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_CDLDRAGONFLYDOJI( 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.cdldragonflydoji(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.cdldragonflydoji(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.Cdldragonflydoji(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 { cdldragonflydoji } 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 } = cdldragonflydoji({ 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: cdldragonflydoji.c · cdldragonflydoji.yaml

Native	File
C	`ta_CDLDRAGONFLYDOJI.c`
Rust	`cdldragonflydoji.rs`
Java	`Core_CDLDRAGONFLYDOJI.java`
C#	`Core_CDLDRAGONFLYDOJI.cs`
TypeScript	`cdldragonflydoji.ts`

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

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

Aliases

Dragonfly Doji