Acceleration Bands (ACCBANDS)

Summary

Acceleration Bands: three overlap lines around price. The middle band is an SMA of the close; the upper/lower bands are SMAs of the high/low scaled by an intraday-range factor.

Chart

Reference data (CSV) · Chart (SVG)

Chart metadata i

Outputs

• outRealUpperBand: upper_limit
• outRealMiddleBand: line
• outRealLowerBand: lower_limit

Formula

factor = 4*(H-L)/(H+L) upperRaw = H*(1+factor), lowerRaw = L*(1-factor) Upper = SMA(upperRaw, N), Middle = SMA(Close, N), Lower = SMA(lowerRaw, N)

Inputs

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

Outputs

• outRealUpperBand — SMA of the range-scaled high band
• outRealMiddleBand — SMA of the close
• outRealLowerBand — SMA of the range-scaled low band

Parameters

Parameter	Type	Default	Accepted values	Description
optInTimePeriod	integer	20	2–100000	SMA smoothing period for all three bands

Properties

Numerical Stability: Start-Independent

✅ Overlap Input i
☐ Independent Y-Axis
☐ 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 close[252]; /* your data, oldest first */
double upperBand[252], middleBand[252], lowerBand[252];
int outBegIdx, outNBElement;

TA_Initialize();
TA_ACCBANDS( 0, n - 1, high, low, close, 20,
             &outBegIdx, &outNBElement, upperBand, middleBand, lowerBand );
printf( "%d values from bar %d; last upperBand = %f\n", outNBElement, outBegIdx, upperBand[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 close = vec![0.0; 252]; // your data, oldest first
let mut upper_band = vec![0.0; 252];
let mut middle_band = vec![0.0; 252];
let mut lower_band = vec![0.0; 252];

let core = Core::new();
let range = core.accbands(0, high.len() - 1, &high, &low, &close, 20,
                          &mut upper_band, &mut middle_band, &mut lower_band)?;
println!("{} values from bar {}; last upper_band = {}", range.count, range.beg_idx, upper_band[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[] close = new double[252]; // your data, oldest first
double[] upperBand = new double[252];
double[] middleBand = new double[252];
double[] lowerBand = new double[252];

Core core = Core.DEFAULT;
OutRange r = core.accbands(0, high.length - 1, high, low, close, 20,
                           upperBand, middleBand, lowerBand);
System.out.println(r.count() + " values from bar " + r.begIdx() + "; last upperBand = " + upperBand[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 close = new double[252]; // your data, oldest first
var upperBand = new double[252];
var middleBand = new double[252];
var lowerBand = new double[252];

var core = Core.Default;
OutRange r = core.Accbands(0, high.Length - 1, high, low, close, 20,
                           upperBand, middleBand, lowerBand);
Console.WriteLine($"{r.Count} values from bar {r.BegIdx}; last upperBand = {upperBand[r.Count - 1]}");

TypeScript

import { accbands } from 'ta-lib';

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,
  outUpperBand,
  outMiddleBand,
  outLowerBand,
} = accbands({ high, low, close }, { timePeriod: 20 });
console.log(outUpperBand.length + ' values from bar ' + begIdx + '; last outUpperBand = ' + outUpperBand[outUpperBand.length - 1]);

Implementation

Added in 0.5.0.

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

Native	File
C	ta_ACCBANDS.c
Rust	accbands.rs
Java	Core_ACCBANDS.java
C#	Core_ACCBANDS.cs
TypeScript	accbands.ts

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

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

Aliases

Acceleration Bands

See Also

SMA · BBANDS