![math.js](https://raw.github.com/josdejong/mathjs/master/misc/img/mathjs.png) [https://mathjs.org](https://mathjs.org) 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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Install math.js using [npm](https://www.npmjs.com/package/mathjs): npm install mathjs Or download mathjs via one of the CDN's listed on the downloads page:     [https://mathjs.org/download.html](https://mathjs.org/download.html#download) Math.js can be used similar to JavaScript's built-in Math library. Besides that, math.js can evaluate [expressions](https://mathjs.org/docs/expressions/index.html) and supports [chained operations](https://mathjs.org/docs/core/chaining.html). ```js import { atan2, chain, derivative, e, evaluate, log, pi, pow, round, sqrt } from 'mathjs' // functions and constants round(e, 3) // 2.718 atan2(3, -3) / pi // 0.75 log(10000, 10) // 4 sqrt(-4) // 2i pow([[-1, 2], [3, 1]], 2) // [[7, 0], [0, 7]] derivative('x^2 + x', 'x') // 2 * x + 1 // expressions evaluate('12 / (2.3 + 0.7)') // 4 evaluate('12.7 cm to inch') // 5 inch evaluate('sin(45 deg) ^ 2') // 0.5 evaluate('9 / 3 + 2i') // 3 + 2i evaluate('det([-1, 2; 3, 1])') // -7 // chaining chain(3) .add(4) .multiply(2) .done() // 14 ``` See the [Getting Started](https://mathjs.org/docs/getting_started.html) for a more detailed tutorial. ## Browser support Math.js works on any ES5 compatible JavaScript engine: node.js, Chrome, Firefox, Safari, Edge, and IE11. ## Documentation - [Getting Started](https://mathjs.org/docs/getting_started.html) - [Examples](https://mathjs.org/examples/index.html) - [Overview](https://mathjs.org/docs/index.html) - [History](https://mathjs.org/history.html) ## Build First clone the project from github: git clone git://github.com/josdejong/mathjs.git cd mathjs Install the project dependencies: npm install Then, the project can be build by executing the build script via npm: npm run build This will build ESM output, CommonJS output, and the bundle math.js from the source files and put them in the folder lib. ## Develop When developing new features for mathjs, it is good to be aware of the following background information. ### Code 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. ### Architecture What mathjs tries to achieve is to offer an environment where you can do calculations with mixed data types, like multiplying a regular `number` with a `Complex` number or a `BigNumber`, and work with all of those in matrices. Mathjs also allows to add a new data type, like say `BigInt`, with little effort. The solution that mathjs uses has two main ingredients: - **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`. - **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. 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. ### Build scripts The build script currently generates two types of output: - **any**, generate entry points to create full versions of all functions - **number**: generating and entry points to create lightweight functions just supporting `number` 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)`. ## Test To execute tests for the library, install the project dependencies once: npm install Then, the tests can be executed: npm test Additionally, the tests can be run on FireFox using [headless mode](https://developer.mozilla.org/en-US/Firefox/Headless_mode): npm run test:browser 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: npm run test:browserstack You can separately run the code linter, though it is also executed with `npm test`: npm run lint To automatically fix linting issue, run: npm run format To test code coverage of the tests: npm run coverage To see the coverage results, open the generated report in your browser: ./coverage/lcov-report/index.html ### Continuous integration testing 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 on all major browsers. [![BrowserStack](https://raw.github.com/josdejong/mathjs/master/misc/browserstack.png)](https://www.browserstack.com) Thanks Github Actions and BrowserStack for the generous free hosting of this open source project! ## License Copyright (C) 2013-2022 Jos de Jong Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at https://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.