https://github.com/stdlib-js/stats-incr-sumabs
Compute a sum of absolute values incrementally.
https://github.com/stdlib-js/stats-incr-sumabs
abs absolute accumulator incremental javascript magnitude math mathematics node node-js nodejs statistics stats stdlib sum summation total value
Last synced: 16 days ago
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Compute a sum of absolute values incrementally.
- Host: GitHub
- URL: https://github.com/stdlib-js/stats-incr-sumabs
- Owner: stdlib-js
- License: apache-2.0
- Created: 2021-06-15T16:14:15.000Z (almost 5 years ago)
- Default Branch: main
- Last Pushed: 2026-02-04T16:03:31.000Z (3 months ago)
- Last Synced: 2026-02-05T03:19:18.285Z (3 months ago)
- Topics: abs, absolute, accumulator, incremental, javascript, magnitude, math, mathematics, node, node-js, nodejs, statistics, stats, stdlib, sum, summation, total, value
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 424 KB
- Stars: 2
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
- Notice: NOTICE
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README
About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
# incrsumabs
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Compute a sum of absolute values incrementally.
The sum of absolute values is defined as
```math
s = \sum_{i=0}^{n-1} |x_i|
```
## Installation
```bash
npm install @stdlib/stats-incr-sumabs
```
Alternatively,
- To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).
- If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).
- For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).
The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
## Usage
```javascript
var incrsumabs = require( '@stdlib/stats-incr-sumabs' );
```
#### incrsumabs()
Returns an accumulator `function` which incrementally computes a sum of absolute values.
```javascript
var accumulator = incrsumabs();
```
#### accumulator( \[x] )
If provided an input value `x`, the accumulator function returns an updated sum. If not provided an input value `x`, the accumulator function returns the current sum.
```javascript
var accumulator = incrsumabs();
var sum = accumulator( 2.0 );
// returns 2.0
sum = accumulator( -1.0 );
// returns 3.0
sum = accumulator( -3.0 );
// returns 6.0
sum = accumulator();
// returns 6.0
```
## Notes
- Input values are **not** type checked. If provided `NaN` or a value which, when used in computations, results in `NaN`, the accumulated value is `NaN` for **all** future invocations. If non-numeric inputs are possible, you are advised to type check and handle accordingly **before** passing the value to the accumulator function.
- For long running accumulations or accumulations of large numbers, care should be taken to prevent overflow.
## Examples
```javascript
var randu = require( '@stdlib/random-base-randu' );
var incrsumabs = require( '@stdlib/stats-incr-sumabs' );
var accumulator;
var v;
var i;
// Initialize an accumulator:
accumulator = incrsumabs();
// For each simulated datum, update the sum...
for ( i = 0; i < 100; i++ ) {
v = ( randu()*100.0 ) - 50.0;
accumulator( v );
}
console.log( accumulator() );
```
* * *
## See Also
- [`@stdlib/stats-incr/meanabs`][@stdlib/stats/incr/meanabs]: compute an arithmetic mean of absolute values incrementally.
- [`@stdlib/stats-incr/msumabs`][@stdlib/stats/incr/msumabs]: compute a moving sum of absolute values incrementally.
- [`@stdlib/stats-incr/sum`][@stdlib/stats/incr/sum]: compute a sum incrementally.
* * *
## Notice
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
## License
See [LICENSE][stdlib-license].
## Copyright
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/stats-incr-sumabs.svg
[npm-url]: https://npmjs.org/package/@stdlib/stats-incr-sumabs
[test-image]: https://github.com/stdlib-js/stats-incr-sumabs/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/stats-incr-sumabs/actions/workflows/test.yml?query=branch:v0.2.3
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/stats-incr-sumabs/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/stats-incr-sumabs?branch=main
[chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg
[chat-url]: https://stdlib.zulipchat.com
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/stats-incr-sumabs/tree/deno
[deno-readme]: https://github.com/stdlib-js/stats-incr-sumabs/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/stats-incr-sumabs/tree/umd
[umd-readme]: https://github.com/stdlib-js/stats-incr-sumabs/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/stats-incr-sumabs/tree/esm
[esm-readme]: https://github.com/stdlib-js/stats-incr-sumabs/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/stats-incr-sumabs/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/stats-incr-sumabs/main/LICENSE
[@stdlib/stats/incr/meanabs]: https://github.com/stdlib-js/stats-incr-meanabs
[@stdlib/stats/incr/msumabs]: https://github.com/stdlib-js/stats-incr-msumabs
[@stdlib/stats/incr/sum]: https://github.com/stdlib-js/stats-incr-sum