LaTeX in plot not showing Greek letter

asked 2014-12-10 20:22:46 +0100

mathochist
125 ●6 ●9 ●14

Hello. I'm using the following code to generate an image of a triangle for a trigonometry quiz.

p = polygon2d([[0,0], [0,3], [4,0]], fill = False, axes = False)
p += text("$\theta$", (3, 0.2), fontsize = 22)
show(p)

The issue is that Sage doesn't seem to recognise $\theta$ as LaTeX, even though it's in dollar signs. In the corner of the triangle, it puts "heta". Why isn't this typesetting correctly? How can I fix it?

Thank you.

answered 2014-12-10 20:39:07 +0100

slelievre
17684 ●22 ●160 ●349 http://carva.org/samue...

updated 2014-12-11 13:31:08 +0100

In the string "$\theta$", the group \t becomes a tab.

You can escape the backslash this way: "$\\theta$".

But it is more convenient to use a raw string: r"$\theta$".

So your code becomes:

p = polygon2d([[0,0], [0,3], [4,0]], fill = False, axes = False)
p += text(r"$\theta$", (3, 0.2), fontsize = 22)
show(p)

Use this trick whenever you have text containing \, which is often the case if your text is latex code!

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Comments

I want to give this more than one up vote! (I mean without messing with the admin panel.) I must have answered this very question 10 times at AIMS, and it happens to me at least once a semester as well. I wonder where a good place to document this would be? (Since our FAQ is moribund - though that would be a pretty good place.)

kcrisman ( 2014-12-10 21:00:02 +0100 )edit

Second kcrisman -- I can't upvote yet but this solution is brilliant -- the kind of "Should have known! How did I not ..."(no, I know about escaping characters, but I would not have come up with this by myself).

Christian Roettger ( 2024-10-08 15:09:30 +0100 )edit

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