# Difference between revisions of "SageMath"

Sage is a program for numerical and symbolic mathematical computation that uses Python as its main language. It is meant to provide an alternative for commercial programs such as Maple, Matlab, and Mathematica.

Sage provides support for the following:

## Installation

Sage can be installed from the official repositories:

## Usage

Sage mainly uses Python as a scripting language with a few modifications to make it better suited for mathematical computations.

### Sage command-line

Sage can be started from the command-line:

$sage  For information on the Sage command-line see this page. The command-line is based on the IPython shell so you can use all its tricks with Sage. For an extensive tutorial on IPython see the community maintained IPython Cookbook. Note, however, that it is not very comfortable for some uses such as plotting. When you try to plot something, for example: sage: plot(sin,(x,0,10))  Sage opens a browser window with the Sage Notebook. ### Sage Notebook A better suited interface for advanced usage in Sage is the Notebook. To start the Notebook server from the command-line, execute: $ sage -n


The notebook will be accessible in the browser from http://localhost:8080 and will require you to login.

However, if you only run the server for personal use, and not across the internet, the login will be an annoyance. You can instead start the Notebook without requiring login, and have it automatically pop up in a browser, with the following command:

$sage -c "notebook(automatic_login=True)"  For a more comprehensive tutorial on the Sage Notebook see the Sage documentation. For more information on the notebook() command see this page. ### Cantor Cantor is an application included in the KDE Edu Project. It acts as a front-end for various mathematical applications such as Maxima, Sage, Octave, Scilab, etc. See the Cantor page on the Sage wiki for more information on how to use it with Sage. Cantor can be installed with the kdeedu-cantor[broken link: replaced by cantor] package or as part of the kde[broken link: package not found] or kdeedu groups, available in the official repositories. ### Documentation For local documentation, one can compile it into multiple formats such as HTML or PDF. To build the whole Sage reference, execute the following command (as root): # sage --docbuild reference html  This builds the HTML documentation for the whole reference tree (may take longer than an hour). An option is to build a smaller part of the documentation tree, but you would need to know what it is you want. Until then, you might consider just browsing the online reference. For a list of documents see sage --docbuild --documents and for a list of supported formats see sage --docbuild --formats. ## Optional additions ### SageTeX If you have installed TeX Live on your system, you may be interested in using SageTeX, a package that makes the inclusion of Sage code in LaTeX files possible. TeX Live is made aware of SageTeX automatically so you can start using it straight away. As a simple example, here is how you include a Sage 2D plot in your TEX document (assuming you use pdflatex): • include the sagetex package in the preamble of your document with the usual \usepackage{sagetex}  • create a sagesilent environment in which you insert your code: \begin{sagesilent} dob(x) = sqrt(x^2 - 1) / (x * arctan(sqrt(x^2 - 1))) dpr(x) = sqrt(x^2 - 1) / (x * log( x + sqrt(x^2 - 1))) p1 = plot(dob,(x, 1, 10), color='blue') p2 = plot(dpr,(x, 1, 10), color='red') ptot = p1 + p2 ptot.axes_labels(['$\\xi$','$\\frac{R_h}{\\max(a,b)}$']) \end{sagesilent}  • create the plot, e.g. inside a float environment: \begin{figure} \begin{center} \sageplot[width=\linewidth]{ptot} \end{center} \end{figure}  • compile your document with the following procedure: $ pdflatex <doc.tex>
$sage <doc.sage>$ pdflatex <doc.tex>

• you can have a look at your output document.

The full documentation of SageTeX is available on CTAN.

## Troubleshooting

### TeX Live does not recognize SageTex

If your TeX Live installation does not find the SageTex package, you can try the following procedure (as root or use a local folder):

• Copy the files to the texmf directory:
# cp /opt/sage/local/share/texmf/tex/* /usr/share/texmf/tex/

• Refresh TeX Live:
# texhash /usr/share/texmf/
texhash: Updating /usr/share/texmf/.//ls-R...
texhash: Done.


### Starting Sage Notebook Server throws an ImportError

The Sage Notebook Server is in an extra package sage-notebook. So, if you get an ImportError when launching

 % sage --notebook
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.4.1, Release Date: 2014-11-23                       │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
Please wait while the Sage Notebook server starts...
Traceback (most recent call last):
File "/usr/bin/sage-notebook", line 180, in <module>
launcher(unknown)
File "/usr/bin/sage-notebook", line 58, in __init__
from sagenb.notebook.notebook_object import notebook
ImportError: No module named sagenb.notebook.notebook_object


you most likely do not have the package sage-notebook installed.