# Chebfun

Chebfun is an open-source software system for numerical computing with functions. The mathematical basis of Chebfun is piecewise polynomial interpolation implemented with what we call “Chebyshev technology”. The foundations are described, with Chebfun examples, in the book _Approximation Theory and Approximation Practice_. Chebfun has extensive capabilities for dealing with linear and nonlinear differential and integral operators, and it also includes continuous analogues of linear algebra notions like QR and singular value decomposition. The Chebfun2 extension works with functions of two variables defined on a rectangle in the x-y plane. To get a sense of the breadth and power of Chebfun, a great place to start is by looking at our [Examples][1].

To install, you can either clone the directory with Git or download a .zip file. Note that a call to clear classes is required if you had a previous version of Chebfun installed.

After unzipping, you will need to add Chebfun to the matlab path. You can do this either (a) by typing


where chebfunroot is the path to the unzipped directory, (b) by selecting the chebfun directory with the pathtool command, or (c) though the File > Set Path... dialog from the matlab menubar.

## Option 2: Clone with Git
To clone the Chebfun repository, first navigate in a terminal to where you want the repository cloned, then type

git clone https://github.com/chebfun/chebfun.git

To use Chebfun in matlab, you will need to add the chebfun` directory to the matlab path as above.

1. Chebfun Guide 7: Linear Differential Operators and Equations Mathworks.
2. Driscoll, T.A., Hale, N., Trefethen, L.N., Chebfun Guide.
3. Trefethen, Nick, List of publications.