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129 lines
3.6 KiB
Markdown
129 lines
3.6 KiB
Markdown
---
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layout: default
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---
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<h1 id="getting-started">Getting Started <a href="#getting-started" title="Permalink">#</a></h1>
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This getting started describes how to install, load, and use math.js.
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<h2 id="install">Install <a href="#install" title="Permalink">#</a></h2>
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Math.js can be installed using various package managers like [npm](https://npmjs.org/), or by just downloading the library from the website: [https://mathjs.org/download.html](https://mathjs.org/download.html).
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To install via npm, run:
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npm install mathjs
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Other ways to install math.js are described on the [website](https://mathjs.org/download.html).
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<h2 id="load">Load <a href="#load" title="Permalink">#</a></h2>
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Math.js can be used in node.js and in the browser. The library must be loaded
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and instantiated. When creating an instance, one can optionally provide
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configuration options as described in
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[Configuration](core/configuration.html).
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<h3 id="es-modules">ES modules <a href="#es-modules" title="Permalink">#</a></h3>
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Load the functions you need and use them:
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```js
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import { sqrt } from 'mathjs'
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console.log(sqrt(-4).toString()) // 2i
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```
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To use lightweight, number only implementations of all functions:
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```js
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import { sqrt } from 'mathjs/number'
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console.log(sqrt(4).toString()) // 2
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console.log(sqrt(-4).toString()) // NaN
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```
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You can create a mathjs instance allowing [configuration](core/configuration.html) and importing of external functions as follows:
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```js
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import { create, all } from 'mathjs'
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const config = { }
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const math = create(all, config)
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console.log(math.sqrt(-4).toString()) // 2i
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```
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How to optimize your bundle size using tree-shaking is described on the page
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[Custom bundling](custom_bundling.html).
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<h3 id="nodejs">Node.js <a href="#nodejs" title="Permalink">#</a></h3>
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Load math.js in [node.js](https://nodejs.org/) (CommonJS module system):
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```js
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const { sqrt } = require('mathjs')
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console.log(sqrt(-4).toString()) // 2i
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```
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<h3 id="browser">Browser <a href="#browser" title="Permalink">#</a></h3>
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Math.js can be loaded as a regular JavaScript file in the browser, use the global
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variable `math` to access the libary once loaded:
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```html
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<!DOCTYPE HTML>
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<html>
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<head>
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<script src="math.js" type="text/javascript"></script>
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</head>
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<body>
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<script type="text/javascript">
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console.log(math.sqrt(-4).toString()) // 2i
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</script>
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</body>
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</html>
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```
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<h2 id="use">Use <a href="#use" title="Permalink">#</a></h2>
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Math.js can be used similar to JavaScript's built-in Math library. Besides that,
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math.js can evaluate expressions (see [Expressions](expressions/index.html)) and
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supports chaining (see [Chaining](core/chaining.html)).
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The example code below shows how to use math.js. More examples can be found in the
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section [Examples](https://mathjs.org/examples/index.html).
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```js
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// functions and constants
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math.round(math.e, 3) // 2.718
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math.atan2(3, -3) / math.pi // 0.75
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math.log(10000, 10) // 4
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math.sqrt(-4) // 2i
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math.pow([[-1, 2], [3, 1]], 2) // [[7, 0], [0, 7]]
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// expressions
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math.evaluate('12 / (2.3 + 0.7)') // 4
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math.evaluate('12.7 cm to inch') // 5 inch
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math.evaluate('sin(45 deg) ^ 2') // 0.5
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math.evaluate('9 / 3 + 2i') // 3 + 2i
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math.evaluate('det([-1, 2; 3, 1])') // -7
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// chained operations
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math.chain(3)
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.add(4)
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.multiply(2)
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.done() // 14
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```
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<h2 id="next">Next <a href="#next" title="Permalink">#</a></h2>
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To learn more about math.js, check out the available documentation and examples:
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- [Documentation](index.html)
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- [Examples](https://mathjs.org/examples/index.html)
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