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20111226 11:05:10 0500  answered a question  Can I add mathematical formulas to a plot? Shashank told you how to do it in matplotlib (which comes with Sage)  matplotlib allows you a lot of control over your plots (I often use it for this reason), but as you can see, it involves a fair bit of boilerplate compared to Sage's plotting. If you want to add a formula to a Sage plot, then you can just use latex inside dollar signs, like you would in a .tex document: Here the 
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20111221 02:27:58 0500  answered a question  Reliability of Sage vs commercial software Compared to Mathematica 6.0.1 (the version of mathematica i bought  without paying more, they won't even let me have version 6.0.2 which fixed a bug I encountered), I have found Sage to be more reliable for what I do. The most important difference is ease of debugging. When you make a mistake, Mathematica plows on. For example, if you forget to define a variable, Mathematica assumes it's symbolic and will keep going until it crashes, hangs, generates a meaningless expression, or you treat it as a list and slice it. if you're lucky Mathematica will give meaningless errors along the way that are hard to trace back to the problem (e.g. they occur 400 lines after the initial problem, and do not mention variable names or line numbers). If you make such a mistake in Sage, it will straight away throw up an error message with a traceback, which makes for MUCH faster debugging. In my few years' experience using Sage, I have run into several parts that were rough around the edges (e.g. interaction with Mathematica, and to a lesser extent numpy/scipy), and found one bug that silently gave me incorrect answers (returning a vector as a row vector instead of a column vector). But then I also found an issue with Mathematica, where results were qualitatively different depending on whether it was run from a notebook or a command line (which turned out to be 32bit vs 64bit). Still, I find it harder to write code that silently gives the wrong answer in Sage than in Mathematica, and it is also much easier to write code that gives the correct answer in Sage than to do the same in Mathematica, due to the errors and tracebacks that Sage provides. Sage almost always gives errors when something goes wrong, which helps you work around its inconsistencies, unlike mathematica, which hopes for the best and gives no advice as to how to work around its inconsistencies. I have had to write my own functions and do lots of numerics  both things which Sage (which incorporates Python and SciPy) is very well suited to, and Mathematica is poorly suited to. Other advantages Sage has, like redo/multiple level undo (provided by your text editor, or to a limited extent in your browser) are just gravy. I don't have too much experience with symbolics. The one time I tried a But the biggest advantage of Sage's price tag is that you have a perpetual free trial. So give it a go  try reproducing some of your Mathematica results in Sage, and see whether it's up to scratch for your needs. 
20111205 10:03:29 0500  answered a question  font size in matplotlib yticks(fontsize=SIZE) should work: 
20111108 23:01:59 0500  commented answer  sage notebook server + ssh tunneling + port forwarding I find it useful to run the `./sage notebook` command from inside a `screen`, so that when I close the SSH tunnel, the Sage server and the worksheets keep running. 
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20110910 17:32:29 0500  commented answer  How can I share code between worksheets? The best way to do it would be to let Virtual Box see the windows directories that you're saving the files in, and give that as the path. I don't have Windows, but on my Mac version of VirtualBox there is a Devices menu with a "Shared Folders..." item, that will set this up. Hopefully you can then work out the path of the shared folder  I guess you should ask a separate question for that, someone with more specific knowledge may be able to help. 
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20110905 16:10:51 0500  answered a question  How can I share code between worksheets? You can write your reuseable functions into a .sage or .py file, store it anywhere on your computer (or the web), and then somewhere in the worksheet (e.g. the top), have a cell with

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20110429 22:54:27 0500  answered a question  Sage relation to Python The Sage notebook doesn't replace a good text editor. It's fantastic for writing 'on the fly' code and for calling prewritten functions, but as far as I know, there's no handy GUI in the notebook for opening, manually editing and saving There is, however, very neat support for executing You can set the path for 
20110427 13:09:30 0500  commented answer  Updating scipy in sage @flutefreak7: sage 4.7 is about to be released in the next few days i think (it's currently at release candidate 0), and it includes scipy 0.9  so hang tight! 
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20110419 03:26:47 0500  answered a question  Physics constants in sage. Scipy, included in sage, has these constants: More details about what is in 
20110410 20:36:18 0500  answered a question  Using Sage Symbolic Functions in Scipy fsolve This is one of the problems you're having: Which can be remedied as such: But this merely exposes another problem: And I don't know how to solve that one. 
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20110322 04:27:40 0500  commented answer  can gridlines be painted at sqrt(2) ? Don't forget the most compact option: sqrt(2.) 
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20110318 22:51:45 0500  answered a question  How do instantiate a new class properly? Instead of " 
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20110317 18:05:54 0500  commented answer  symbolic calculus on doubling points in elliptic curves probably because it was merged 9 hours ago ;) 
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20110317 16:31:13 0500  answered a question  symbolic calculus on doubling points in elliptic curves In the next version of sage (4.7) you will be able to use the functions In the meantime you'll need to define them yourself: For usage examples and more documentation, see the patch that adds this functionality. There is one example which is very similar to yours: 