@stdlib/stats-base-dists-laplace-cdf

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Cumulative Distribution Function

Laplace distribution cumulative distribution function.

The cumulative distribution function for a Laplace random variable is

where mu is the location parameter and b > 0 is the scale parameter.

Installation

npm install @stdlib/stats-base-dists-laplace-cdf

Usage

var cdf = require( '@stdlib/stats-base-dists-laplace-cdf' );

cdf( x, mu, b )

Evaluates the cumulative distribution function (CDF) for a Laplace distribution with parameters mu (location parameter) and b > 0 (scale parameter).

var y = cdf( 2.0, 0.0, 1.0 );
// returns ~0.932

y = cdf( 5.0, 10.0, 3.0 );
// returns ~0.094

If provided NaN as any argument, the function returns NaN.

var y = cdf( NaN, 0.0, 1.0 );
// returns NaN

y = cdf( 0.0, NaN, 1.0 );
// returns NaN

y = cdf( 0.0, 0.0, NaN );
// returns NaN

If provided b <= 0, the function returns NaN.

var y = cdf( 2.0, 0.0, -1.0 );
// returns NaN

y = cdf( 2.0, 0.0, 0.0 );
// returns NaN

cdf.factory( mu, b )

Returns a function for evaluating the cumulative distribution function of a Laplace distribution with parameters mu (location parameter) and b > 0 (scale parameter).

var mycdf = cdf.factory( 3.0, 1.5 );

var y = mycdf( 1.0 );
// returns ~0.132

y = mycdf( 4.0 );
// returns ~0.743

Examples

var randu = require( '@stdlib/random-base-randu' );
var cdf = require( '@stdlib/stats-base-dists-laplace-cdf' );

var mu;
var b;
var x;
var y;
var i;

for ( i = 0; i < 100; i++ ) {
    x = randu() * 10.0;
    mu = randu() * 10.0;
    b = randu() * 10.0;
    y = cdf( x, mu, b );
    console.log( 'x: %d, µ: %d, b: %d, F(x;µ,b): %d', x.toFixed( 4 ), mu.toFixed( 4 ), b.toFixed( 4 ), y.toFixed( 4 ) );
}

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Notice

This package is part of 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, see the main project repository.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2023. The Stdlib Authors.

Changelog

0.1.0 (2023-09-24)

<section class="features">

Features

• 81ca3ab - update minimum TypeScript version

</section> <!-- /.features --> <section class="breaking-changes">

BREAKING CHANGES

• 81ca3ab: update minimum TypeScript version to 4.1

  • To migrate, users should upgrade their TypeScript version to at least version 4.1.

</section> <!-- /.breaking-changes --> <section class="commits">

Commits

<details>

• 81ca3ab - feat: update minimum TypeScript version (by Philipp Burckhardt)
• d5fa8e8 - test: use strictEqual checks (by Philipp Burckhardt)
• 640025b - build: use supported operators for GitHub rendering (by Philipp Burckhardt)
• 37f032d - docs: render equations via math code blocks (by Philipp Burckhardt)

</details> </section> <!-- /.commits --> <section class="contributors">

Contributors

A total of 1 person contributed to this release. Thank you to this contributor:

• Philipp Burckhardt

</section> <!-- /.contributors --> </section> <!-- /.release --> <section class="release" id="v0.0.7">