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2014-05-13 02:57:04 -0500 answered a question xkcd and matplotlib

Hi. It seems that other people had that problem with the xkcd font in matplotlib. Here there is an interesting post concerning hte issue:

In your case probably you only need to rebuild the cache with the command:

$ rm ~/.matplotlib/fontList.cache

Hope this helps.

2014-05-01 15:20:05 -0500 received badge  Nice Answer (source)
2014-04-30 05:52:10 -0500 answered a question Controling the color of a parametric surface.

Hi. If I understand correctly, your question is related to this section of the Sage Trac (colormaps on implicit and parametric plots):

It seems that the feature still requires some work.

2014-04-16 17:04:04 -0500 received badge  Teacher (source)
2014-04-16 02:44:14 -0500 answered a question Substitute and evaluate

You can use:

f (x,y)=x+y

a = 2; b = 3


In this way you obtain 5, the desired result. Actually you don't need x and y, you could use only a and b, but I put different names just to underline the mechanism. The first line defines the function f with generic variables. The last line calculates the value of f when you actually pass the values of the variables. It can be a bit confusing at first, I hope my example can help.

2014-04-14 12:15:29 -0500 commented answer Symbolic algebra: Sage, Maxima, Ginac, Sympy?

Thanks for the clarifications and the link. Sometimes is not easy to understand the differences and the mutual dependencies of the various mathematical package related to Sage. For this reason your answer is really helpful, I will continue to experiment with Sage and Sympy.

2014-04-14 08:11:10 -0500 asked a question Symbolic algebra: Sage, Maxima, Ginac, Sympy?

Hi all. In this period I am working on symbolic matrices, and I am a bit confused about the various possibilities and the mutual relationships.

If I understand correctly, for symbolic computation Sage uses Ginac and Maxima, but I have no a clear idea of the different roles of the two packages in Sage own engine.

Furthermore, I am reading some tutorials about Sympy. I know that Sympy is included in the huge library of Sage packages, but it is not directly used in any way by Sage for symbolic computation? Could you please clarify a bit these points?


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2013-07-30 09:56:06 -0500 marked best answer Jmol 3D viewer problem in Linux

Avoid using icedtea-java with jmol. jmol works reliably and is tested only on oracle-java.

2013-07-30 09:55:14 -0500 answered a question Jmol 3D viewer problem in Linux

Thanks to the precise indication by ppurka I have been able to completely solve the problem. If someone working on Linux finds similar problems, here there is a detailed guide for the (not so simple) task to install Oracle Java jdk and jre in Ubuntu (I actually use Mint, but the guide has worked well the same):

After installing Oracle Java and activacting it in Firefox, now the Jmol viewer works flawlessly, also with the advanced controls.

Hope this can be useful to somebody. Thanks again to ppurka.

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2013-07-30 04:16:07 -0500 asked a question Jmol 3D viewer problem in Linux

Hi all. I noticed some problems with 3D plots in the Sage notebook under Linux (Mint 15 KDE guest in VirtualBox). When I try to use the Advanced Controls of Jmol 3D viewer, the system always freezes. In particular, when I try to access the "Color and Mesh" tab, Firefox gives an error concerning a plugin called "IcedTea-Web".

I don't find similar problems running directly Sage in VirtualBox under Windows 7 64 bit.

Do you have any idea about the problem? Thanks.

2013-07-24 02:35:19 -0500 received badge  Supporter (source)
2013-07-24 02:20:59 -0500 commented answer How to load a Python program in Sage Notebook from Menu

Thanks for the answer.

2013-07-23 09:28:52 -0500 asked a question How to load a Python program in Sage Notebook from Menu

Hi all, I would like to know if is it possible from the graphical menu of the Sage notebook to insert a program in Python written in an external editor (as Spyder) inside a cell of the notebook. I tried with Data->Upload, but I did not understand how it works. I know that it is possible to directly use the command "load(program)", but it is not too comfortable, requiring to write the whole path of the file. Thanks.