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# abs [![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] > Compute the [absolute value][absolute-value] of a double-precision floating-point number.
The [absolute value][absolute-value] is defined as
Absolute value
## Installation ```bash npm install @stdlib/math-base-special-abs ```
## Usage ```javascript var abs = require( '@stdlib/math-base-special-abs' ); ``` #### abs( x ) Computes the [absolute value][absolute-value] of a double-precision floating-point number. ```javascript var v = abs( -1.0 ); // returns 1.0 v = abs( 2.0 ); // returns 2.0 v = abs( 0.0 ); // returns 0.0 v = abs( -0.0 ); // returns 0.0 v = abs( NaN ); // returns NaN ```
## Examples ```javascript var discreteUniform = require( '@stdlib/random-array-discrete-uniform' ); var logEachMap = require( '@stdlib/console-log-each-map' ); var abs = require( '@stdlib/math-base-special-abs' ); var x = discreteUniform( 100, -100, 100, { 'dtype': 'float64' }); logEachMap( 'abs(%d) = %d', x, abs ); ```
* * *
## C APIs
### Usage ```c #include "stdlib/math/base/special/abs.h" ``` #### stdlib_base_abs( x ) Computes the absolute value of a double-precision floating-point number. ```c double y = stdlib_base_abs( -5.0 ); // returns 5.0 ``` The function accepts the following arguments: - **x**: `[in] double` input value. ```c double stdlib_base_abs( const double x ); ```
### Examples ```c #include "stdlib/math/base/special/abs.h" #include int main( void ) { const double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 }; double y; int i; for ( i = 0; i < 4; i++ ) { y = stdlib_base_abs( x[ i ] ); printf( "|%lf| = %lf\n", x[ i ], y ); } } ```
* * * ## See Also - [`@stdlib/math-base/special/abs2`][@stdlib/math/base/special/abs2]: compute the squared absolute value of a double-precision floating-point number. - [`@stdlib/math-base/special/absf`][@stdlib/math/base/special/absf]: compute the absolute value of a single-precision floating-point number. - [`@stdlib/math-base/special/labs`][@stdlib/math/base/special/labs]: compute an absolute value of a signed 32-bit integer.
* * * ## 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/math-base-special-abs.svg [npm-url]: https://npmjs.org/package/@stdlib/math-base-special-abs [test-image]: https://github.com/stdlib-js/math-base-special-abs/actions/workflows/test.yml/badge.svg?branch=v0.2.3 [test-url]: https://github.com/stdlib-js/math-base-special-abs/actions/workflows/test.yml?query=branch:v0.2.3 [coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-base-special-abs/main.svg [coverage-url]: https://codecov.io/github/stdlib-js/math-base-special-abs?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/math-base-special-abs/tree/deno [deno-readme]: https://github.com/stdlib-js/math-base-special-abs/blob/deno/README.md [umd-url]: https://github.com/stdlib-js/math-base-special-abs/tree/umd [umd-readme]: https://github.com/stdlib-js/math-base-special-abs/blob/umd/README.md [esm-url]: https://github.com/stdlib-js/math-base-special-abs/tree/esm [esm-readme]: https://github.com/stdlib-js/math-base-special-abs/blob/esm/README.md [branches-url]: https://github.com/stdlib-js/math-base-special-abs/blob/main/branches.md [stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-base-special-abs/main/LICENSE [absolute-value]: https://en.wikipedia.org/wiki/Absolute_value [@stdlib/math/base/special/abs2]: https://www.npmjs.com/package/@stdlib/math-base-special-abs2 [@stdlib/math/base/special/absf]: https://www.npmjs.com/package/@stdlib/math-base-special-absf [@stdlib/math/base/special/labs]: https://www.npmjs.com/package/@stdlib/math-base-special-labs