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Mercyhurst UniversityDept of Math and ITDr Williams Home

Sage Math Reference

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Sage Resources

It is very possible that some of the information here is out of date, and it is absolutely incomplete. The following links would be much more useful: In class, we'll be using CoCalc, the online version of Sage. Resources for CoCalc can be found here:

What is Sage?

From the sagemath.org website:
SageMath is a free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and many more. Access their combined power through a common, Python-based language or directly via interfaces or wrappers.
Put simply, Sage is among the most powerful and sophisticated mathematical software - and it's free! Not only that, but you can contribute. If there's a feature you find missing, you can write your own code to be included in the software that's available to mathematicians everywhere. Sage is built on Python, so some basic Python knowledge is helpful.

Some notable facts about Sage:


Using Sage

There are several options for using Sage:

Installing on your machine

The advantage here is that you can use your own computer's power to perform computations even if you don't have an internet connection, but you still have access to Sage's server if your machine is online. A disadvantage is that Sage is difficult to install on a Windows machine - Mac and Linux users should have no problem, so if you have a Mac or would like to experiment with Linux, I would highly recommend installing Sage locally. Again, it's free, and is fairly "lightweight" in terms of disk usage and system requirements.

If you'd like to install Sage, go to the Sage website and click Download. You'll be presented with a list of possible servers from which to download the package. Choose one closest to you (any in North America should be fine), and install as usual.

Sage Cells

This is a very useful, often overlooked option, though it's not meant for large projects or work that needs to be saved. Sage 'cells' can be embedded in any web page, like this one. Click the 'Evaluate' button below to find the value of \(f(x) = 3x^2-\sqrt{x}+1\) when \(x = 4\). Note, you may have to accept the terms of use the first time you run a cell on your machine - you will not need to keep doing this.

The cell isn't 'programmed' to only handle this simple example. Change the text in the cell to any Python or Sage code you like, and evaluate again. Try something as trivial as 1+2, or something like plot(x^3) if you'd like to see a nice picture. There are also many options for customizing the cells, if you plan to use them in your own web pages. The tutorials in these pages will make frequent use of cells.

CoCalc

CoCalc (formerly called Sage Cloud) is by far the easiest way to get started with Sage, and is getting better all the time. You'll need an account (free!), and you'll be able to create as many projects and files as you like. The learning curve has flattened out a bit, and CoCalc now includes lots of "helper" features like basic structure and syntax templates, examples of mathematical object definitions and methods, and more. You can use CoCalc for more than Sage too - it's also a great way to try programming in a variety of languages (including basic Python, of course) and even typesetting languages like HTML and LaTeX.

To try Sage right now, go to cocalc.com.