2016-01-03 11:33:31 +0200 received badge ● Famous Question (source) 2013-12-04 15:39:42 +0200 received badge ● Notable Question (source) 2013-07-08 18:58:24 +0200 received badge ● Famous Question (source) 2013-01-29 10:46:56 +0200 received badge ● Popular Question (source) 2012-12-29 05:59:04 +0200 received badge ● Notable Question (source) 2012-09-19 19:01:24 +0200 received badge ● Popular Question (source) 2012-01-05 23:16:56 +0200 received badge ● Good Question (source) 2011-12-27 13:39:26 +0200 received badge ● Nice Question (source) 2011-12-27 05:40:15 +0200 commented answer Can I add mathematical formulas to a plot? Thanks, this is the kind of solution I was hoping for. 2011-12-27 05:39:50 +0200 marked best answer 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: text(r"Here's a formula $\frac{\sqrt{3}}{2}$ and some text",(1,2))  Here the r" is necessary due to all the slashes in the stringif you don't include the r then you'll have to escape each of the slashes (check out the python String documentation for more info on that). 2011-12-27 05:39:46 +0200 commented answer Can I add mathematical formulas to a plot? Thanks for this example, i'll need some time though to learn what all the commands do. 2011-12-26 17:29:35 +0200 received badge ● Student (source) 2011-12-26 17:11:26 +0200 asked a question Can I add mathematical formulas to a plot? I know that using text("Sage is really neat!!",(1,2))  one can easily add text to a plot in Sage. But searching the documentation I couldn't find a way to add a formula, say $\frac{1}{\sqrt{x^2-1}}$. So is there a way to add a formula to a plot? Ideally using LaTeX to enter the formula. 2011-07-01 12:40:12 +0200 received badge ● Scholar (source) 2011-07-01 12:40:12 +0200 marked best answer How to give latex names to generators of polynomial rings? First of all, when you define a_ij=var('a_ij') then you define symbolic variables. But when you later do (with inject_on()) PolynomialRing(QQ,a_ij), then a_ij becomes a generator of a polynomial ring. It is a very common mistake to confuse these two very different objects, and I recommend that you carefully decide whether you want to work with polynomials (i.e., you have a polynomial ring, ideals, want to compute Gröbner bases and those things) or with symbolic expressions (they may happen to look like a polynomial, but provide largely different features). In particular, since a_ij has completely changed its meaning, it is no surprise that the latex name has gone. You could do: sage: R. = QQ[] # you don't need inject_on() sage: type(a_12) # It is not a symbolic variable! sage: latex(a_12) # This is not how you like it a_{12} sage: R._latex_names # This is where the names are stored ['a_{12}', 'a_{23}'] sage: R._latex_names = ['a_{1,2}','a_{2,3}'] # Override it... sage: latex(a_12) # ... and enjoy a_{1,2}  I think it is a hack, and there should be a method, say, R.set_latex_names(), but unfortunately there isn't, yet. 2011-06-30 13:37:34 +0200 commented answer How to give latex names to generators of polynomial rings? Thanks! That seems to work. Indeed there are several things I don't quite understand about variables and how they are handled and accessed. I knew that there was a difference between symbolic variables and generators of a polynomial ring. So in my example the symbolic variable was redefined to be a generator of a polynomial ring and got lost? Anyway I do indeed need Groebner bases so symbolic variables should not be of interest in my situation. 2011-06-30 13:26:41 +0200 received badge ● Supporter (source) 2011-06-30 12:19:58 +0200 received badge ● Editor (source) 2011-06-30 12:18:10 +0200 asked a question How to give latex names to generators of polynomial rings? Apologies if I don't use the right terminology in my question. I'm fairly new to Sage and programming. The question is basically in the title but here are more details: Ideally I would like to create a multivariate polynomial ring with generators indexed by multiindices. As far as I understand this is not directly supported at the moment, although I've found a useful workaround here. What I'm missing though is the ability to display these generators correctly in LaTex (say as a_{i,j}). I know that one can assign latex names to symbolic variables with the command sage: a_ij=var('a_ij', latex_name="a_{i,j}"); sage: latex(a_ij); a_{i,j} And I've tried putting this before the definition of my polynomial ring. But as soon as I declare the polynomial ring the latex name I assigned seems to be forgotten: sage: inject_on(); sage: PolynomialRing(QQ,a_ij) sage: latex(a_ij); a_{\mbox{ij}} So: Question: How can I define a multivariate polynomial ring in Sage and assign my preferred latex names to its generators?