Plus Directional Movement (PLUS_DM)

Summary

Plus Directional Movement: the Wilder-smoothed accumulation of upward directional movement (+DM1). A component of the Directional Movement System used to build +DI/DX/ADX.

Chart

Reference data (CSV) · Chart (SVG)

Chart metadata i

Outputs

• outReal: line · zero · positive

Formula

+DM1 = (high - prevHigh) if (high-prevHigh) > 0 and > (prevLow-low), else 0. period<=1: output = +DM1 per bar. period>1: seed = sum of first (period-1) +DM1; then Wilder smoothing: +DM = prevPlusDM - prevPlusDM/period + +DM1(today)

Inputs

• inHigh — High price of each bar
• inLow — Low price of each bar

Outputs

• outReal — Smoothed plus directional movement

Parameters

Parameter	Type	Default	Accepted values	Description
optInTimePeriod	integer	14	1–100000	Wilder smoothing period

Properties

Numerical Stability: Initial Unstable Period

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

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

Example

C

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

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

TA_Initialize();
TA_PLUS_DM( 0, n - 1, high, low, 14, &outBegIdx, &outNBElement, out );
printf( "%d values from bar %d; last out = %f\n", outNBElement, outBegIdx, out[outNBElement - 1] );

Rust

use ta_lib::Core;

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

let core = Core::new();
let range = core.plus_dm(0, high.len() - 1, &high, &low, 14, &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[] high = new double[252]; // your data, oldest first
double[] low = new double[252]; // your data, oldest first
double[] out = new double[252];

Core core = Core.DEFAULT;
OutRange r = core.plusDm(0, high.length - 1, high, low, 14, out);
System.out.println(r.count() + " values from bar " + r.begIdx() + "; last out = " + out[r.count() - 1]);

C#

using System;
using TALib;

var high = new double[252]; // your data, oldest first
var low = new double[252]; // your data, oldest first
var outReal = new double[252];

var core = Core.Default;
OutRange r = core.PlusDm(0, high.Length - 1, high, low, 14, outReal);
Console.WriteLine($"{r.Count} values from bar {r.BegIdx}; last outReal = {outReal[r.Count - 1]}");

TypeScript

import { plusDm } from 'ta-lib';

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

const { begIdx, values } = plusDm({ high, low }, { timePeriod: 14 });
console.log(values.length + ' values from bar ' + begIdx + '; last values = ' + values[values.length - 1]);

Implementation

Added in 0.4.0.

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

Native	File
C	ta_PLUS_DM.c
Rust	plus_dm.rs
Java	Core_PLUS_DM.java
C#	Core_PLUS_DM.cs
TypeScript	plusDm.ts

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

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

Aliases

+DM, Plus Directional Movement

See Also

MINUS_DM · PLUS_DI · MINUS_DI · DX · ADX · ADXR

References

• J. Welles Wilder, New Concepts in Technical Trading Systems, Trend Research (ISBN 0894590278)