Summation (SUM)

Summary

Rolling sum of the input over a fixed period. Each output is the sum of the most recent optInTimePeriod input values.

Chart

Reference data (CSV) · Chart (SVG)

Chart metadata i

Outputs

• outReal: line · zero · positive · negative

Formula

$out_i = \sum_{j=i-(N-1)}^{i} inReal_j$, N = optInTimePeriod

Inputs

• inReal — Values to sum

Outputs

• outReal — Windowed sum over the period

Parameters

Parameter	Type	Default	Accepted values	Description
optInTimePeriod	integer	30	2–100000	Window length summed

Properties

Numerical Stability: Start-Independent

☐ 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 series[252]; /* your data, oldest first */
double out[252];
int outBegIdx, outNBElement;

TA_Initialize();
TA_SUM( 0, n - 1, series, 30, &outBegIdx, &outNBElement, out );
printf( "%d values from bar %d; last out = %f\n", outNBElement, outBegIdx, out[outNBElement - 1] );

Rust

use ta_lib::Core;

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

let core = Core::new();
let range = core.sum(0, series.len() - 1, &series, 30, &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[] series = new double[252]; // your data, oldest first
double[] out = new double[252];

Core core = Core.DEFAULT;
OutRange r = core.sum(0, series.length - 1, series, 30, out);
System.out.println(r.count() + " values from bar " + r.begIdx() + "; last out = " + out[r.count() - 1]);

C#

using System;
using TALib;

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

var core = Core.Default;
OutRange r = core.Sum(0, series.Length - 1, series, 30, outReal);
Console.WriteLine($"{r.Count} values from bar {r.BegIdx}; last outReal = {outReal[r.Count - 1]}");

TypeScript

import { sum } from 'ta-lib';

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

const { begIdx, values } = sum(series, { timePeriod: 30 });
console.log(values.length + ' values from bar ' + begIdx + '; last values = ' + values[values.length - 1]);

Implementation

Added in 0.4.0.

TA-Lib Definition: sum.c · sum.yaml

Native	File
C	ta_SUM.c
Rust	sum.rs
Java	Core_SUM.java
C#	Core_SUM.cs
TypeScript	sum.ts

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

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

Aliases

Summation, Rolling Sum, Moving Sum

See Also

SMA