npm install math-powerExponential Function
===
[![NPM version][npm-image]][npm-url] [![Build Status][build-image]][build-url] [![Coverage Status][coverage-image]][coverage-url] [![Dependencies][dependencies-image]][dependencies-url]
> [Exponential function][exponential-function].
The [exponential function][exponential-function] is defined as
where b is the __base__ and x is the __exponent__.
Installation
`` bash`
$ npm install math-power
Usage
` javascript`
var pow = require( 'math-power' );
#### pow( base, exponent )
Evaluates the [exponential function][exponential-function].
` javascript
var val = pow( 2, 3 );
// returns 8
val = pow( 4, 0.5 );
// returns 2
val = pow( 100, 0 );
// returns 1
val = pow( Math.PI, 5 );
// returns ~306.0197
val = pow( Math.PI, -1/5 );
// returns ~0.7954
val = pow( NaN, 3 );
// returns NaN
val = pow( 5, NaN );
// returns NaN
`
Examples
` javascript
var pow = require( 'math-power' );
var b;
var x;
var i;
for ( i = 0; i < 100; i++ ) {
b = Math.round( Math.random()*10 );
x = Math.round( Math.random()*10 ) - 5;
console.log( '%d^%d = %d', b, x, pow( b, 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-power.svg
[npm-url]: https://npmjs.org/package/math-power
[build-image]: http://img.shields.io/travis/math-io/power/master.svg
[build-url]: https://travis-ci.org/math-io/power
[coverage-image]: https://img.shields.io/codecov/c/github/math-io/power/master.svg
[coverage-url]: https://codecov.io/github/math-io/power?branch=master
[dependencies-image]: http://img.shields.io/david/math-io/power.svg
[dependencies-url]: https://david-dm.org/math-io/power
[dev-dependencies-image]: http://img.shields.io/david/dev/math-io/power.svg
[dev-dependencies-url]: https://david-dm.org/dev/math-io/power
[github-issues-image]: http://img.shields.io/github/issues/math-io/power.svg
[github-issues-url]: https://github.com/math-io/power/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