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![math.js](https://raw.github.com/josdejong/mathjs/master/misc/img/mathjs.png)
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[https://mathjs.org](https://mathjs.org)
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Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with different data types like numbers, big numbers, complex numbers, fractions, units, and matrices. Powerful and easy to use.
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[![Version](https://img.shields.io/npm/v/mathjs.svg)](https://www.npmjs.com/package/mathjs)
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[![Downloads](https://img.shields.io/npm/dm/mathjs.svg)](https://www.npmjs.com/package/mathjs)
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[![Build Status](https://github.com/josdejong/mathjs/workflows/Node.js%20CI/badge.svg)](https://github.com/josdejong/mathjs/actions)
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[![Maintenance](https://img.shields.io/maintenance/yes/2021.svg)](https://github.com/josdejong/mathjs/graphs/commit-activity)
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[![License](https://img.shields.io/github/license/josdejong/mathjs.svg)](https://github.com/josdejong/mathjs/blob/master/LICENSE)
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[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fjosdejong%2Fmathjs.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fjosdejong%2Fmathjs?ref=badge_shield)
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[![Slack](https://slack.bri.im/badge.svg)](https://slack.bri.im)
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## Features
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- Supports numbers, big numbers, complex numbers, fractions, units, strings, arrays, and matrices.
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- Is compatible with JavaScript's built-in Math library.
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- Contains a flexible expression parser.
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- Does symbolic computation.
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- Comes with a large set of built-in functions and constants.
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- Can be used as a command line application as well.
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- Runs on any JavaScript engine.
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- Is easily extensible.
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- Open source.
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## Usage
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Math.js can be used in both node.js and in the browser.
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Install math.js using [npm](https://www.npmjs.com/package/mathjs):
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npm install mathjs
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> Note that when using mathjs in a TypeScript project, you will have to install type definition files too: `npm install @types/mathjs`.
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Or download mathjs via one of the CDN's listed on the downloads page:
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[https://mathjs.org/download.html](https://mathjs.org/download.html#download)
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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
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[expressions](https://mathjs.org/docs/expressions/index.html)
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and supports
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[chained operations](https://mathjs.org/docs/core/chaining.html).
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```js
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import {
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atan2, chain, derivative, e, evaluate, log, pi, pow, round, sqrt
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} from 'mathjs'
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// functions and constants
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round(e, 3) // 2.718
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atan2(3, -3) / pi // 0.75
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log(10000, 10) // 4
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sqrt(-4) // 2i
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pow([[-1, 2], [3, 1]], 2) // [[7, 0], [0, 7]]
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derivative('x^2 + x', 'x') // 2 * x + 1
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// expressions
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evaluate('12 / (2.3 + 0.7)') // 4
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evaluate('12.7 cm to inch') // 5 inch
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evaluate('sin(45 deg) ^ 2') // 0.5
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evaluate('9 / 3 + 2i') // 3 + 2i
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evaluate('det([-1, 2; 3, 1])') // -7
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// chaining
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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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See the [Getting Started](https://mathjs.org/docs/getting_started.html) for a more detailed tutorial.
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## Browser support
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Math.js works on any ES5 compatible JavaScript engine: node.js, Chrome, Firefox, Safari, Edge, and IE11.
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## Documentation
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- [Getting Started](https://mathjs.org/docs/getting_started.html)
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- [Examples](https://mathjs.org/examples/index.html)
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- [Overview](https://mathjs.org/docs/index.html)
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- [History](https://mathjs.org/history.html)
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## Build
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First clone the project from github:
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git clone git://github.com/josdejong/mathjs.git
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cd mathjs
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Install the project dependencies:
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npm install
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Then, the project can be build by executing the build script via npm:
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npm run build
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This will build ESM output, CommonJS output, and the bundle math.js
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from the source files and put them in the folder lib.
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## Develop
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When developing new features for mathjs, it is good to be aware of the following background information.
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### Code
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The code of `mathjs` is written in ES modules, and requires all files to have a real, relative path, meaning the files must have a `*.js` extension. Please configure adding file extensions on auto import in your IDE.
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### Architecture
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What mathjs tries to achieve is to offer an environment where you can do calculations with mixed data types,
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like multiplying a regular `number` with a `Complex` number or a `BigNumber`, and work with all of those in matrices.
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Mathjs also allows to add a new data type, like say `BigInt`, with little effort.
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The solution that mathjs uses has two main ingredients:
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- **Typed functions**. All functions are created using [`typed-function`](https://github.com/josdejong/typed-function/). This makes it easier to (dynamically) create and extend a single function with new data types, automatically do type conversions on function inputs, etc. So, if you create function multiply for two `number`s, you can extend it with support for multiplying two `BigInts`. If you define a conversion from `BigInt` to `number`, the typed-function will automatically allow you to multiply a `BigInt` with a `number`.
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- **Dependency injection**. When we have a function `multiply` with support for `BigInt`, thanks to the dependency injection, other functions using `multiply` under the hood, like `prod`, will automatically support `BigInt` too. This also works the other way around: if you don't need the heavyweight `multiply` (which supports BigNumbers, matrices, etc), and you just need a plain and simple number support, you can use a lightweight implementation of `multiply` just for numbers, and inject that in `prod` and other functions.
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At the lowest level, mathjs has immutable factory functions which create immutable functions. The core function `math.create(...)` creates a new instance having functions created from all passed factory functions. A mathjs instance is a collection of created functions. It contains a function like `math.import` to allow extending the instance with new functions, which can then be used in the expression parser.
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### Build scripts
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The build script currently generates two types of output:
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- **any**, generate entry points to create full versions of all functions
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- **number**: generating and entry points to create lightweight functions just supporting `number`
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For each function, an object is generated containing the factory functions of all dependencies of the function. This allows to just load a specific set of functions, and not load or bundle any other functionality. So for example, to just create function `add` you can do `math.create(addDependencies)`.
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## Test
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To execute tests for the library, install the project dependencies once:
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npm install
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Then, the tests can be executed:
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npm test
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Additionally, the tests can be run on FireFox using [headless mode](https://developer.mozilla.org/en-US/Firefox/Headless_mode):
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npm run test:browser
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To run the tests remotely on BrowserStack, first set the environment variables `BROWSER_STACK_USERNAME` and `BROWSER_STACK_ACCESS_KEY` with your username and access key and then execute:
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npm run test:browserstack
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To test code coverage of the tests:
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npm run coverage
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To see the coverage results, open the generated report in your browser:
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./coverage/lcov-report/index.html
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### Continuous integration testing
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Continuous integration tests are run on [Github Actions](https://github.com/josdejong/mathjs/actions) and [BrowserStack](https://www.browserstack.com) every time a commit is pushed to github. Github Actions runs the tests for different versions of node.js, and BrowserStack runs the tests are run on all major browsers.
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[![BrowserStack](https://raw.github.com/josdejong/mathjs/master/misc/browserstack.png)](https://www.browserstack.com)
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Thanks Github Actions and BrowserStack for the generous free hosting of this open source project!
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## License
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Copyright (C) 2013-2021 Jos de Jong <wjosdejong@gmail.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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