npm install math-expNatural Exponential Function
===
[![NPM version][npm-image]][npm-url] [![Build Status][build-image]][build-url] [![Coverage Status][coverage-image]][coverage-url] [![Dependencies][dependencies-image]][dependencies-url]
> Natural [exponential function][exponential-function].
The natural [exponential function][exponential-function] is defined as
where e is [Euler's][eulers-number] number.
Installation
`` bash`
$ npm install math-exp
Usage
` javascript`
var exp = require( 'math-exp' );
#### exp( x )
Evaluates the natural [exponential function][exponential-function].
` javascript
var val = exp( 4 );
// returns ~54.5982
val = exp( -9 );
// returns ~1.234e-4
val = exp( 0 );
// returns 1
val = exp( NaN );
// returns NaN
`
Examples
` javascript
var exp = require( 'math-exp' );
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = Math.random()*100 - 50;
console.log( 'e^%d = %d', x, exp( x ) );
}
`
To run the example code from the top-level application directory,
` bash`
$ node ./examples/index.js
---
Tests
$3
This repository uses [tape][tape] for unit tests. To run the tests, execute the following command in the top-level application directory:
` bash`
$ make test
All new feature development should have corresponding unit tests to validate correct functionality.
$3
This repository uses [Istanbul][istanbul] as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:
` bash`
$ make test-cov
Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,
` bash`
$ make view-cov
$3
This repository uses [Testling][testling] for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:
` bash`
$ make test-browsers
To view the tests in a local web browser,
` bash``
$ make view-browser-tests
---
License
Copyright
Copyright © 2016. The [Compute.io][compute-io] Authors.
[npm-image]: http://img.shields.io/npm/v/math-exp.svg
[npm-url]: https://npmjs.org/package/math-exp
[build-image]: http://img.shields.io/travis/math-io/exp/master.svg
[build-url]: https://travis-ci.org/math-io/exp
[coverage-image]: https://img.shields.io/codecov/c/github/math-io/exp/master.svg
[coverage-url]: https://codecov.io/github/math-io/exp?branch=master
[dependencies-image]: http://img.shields.io/david/math-io/exp.svg
[dependencies-url]: https://david-dm.org/math-io/exp
[dev-dependencies-image]: http://img.shields.io/david/dev/math-io/exp.svg
[dev-dependencies-url]: https://david-dm.org/dev/math-io/exp
[github-issues-image]: http://img.shields.io/github/issues/math-io/exp.svg
[github-issues-url]: https://github.com/math-io/exp/issues
[tape]: https://github.com/substack/tape
[istanbul]: https://github.com/gotwarlost/istanbul
[testling]: https://ci.testling.com
[compute-io]: https://github.com/compute-io/
[exponential-function]: https://en.wikipedia.org/wiki/Exponential_function
[eulers-number]: https://en.wikipedia.org/wiki/E_(mathematical_constant)