This bug was introduced in PR #54.  That tried to fix the behavior of the apostrophe character, but inadvertently made primes smaller as well.  The fix is revert prime to its old size, but make the apostrophe equivalent to "^\prime".

Are you able to test the following pull request and ensure that it resolves your issues?

https://github.com/matplotlib/matplotlib/pull/836

Mike

On 04/16/2012 10:13 AM, Alexander Wagner wrote:
ps. my math-related rcParams are just the defaults, i think

mathtext.cal : cursive
mathtext.rm  : serif
mathtext.tt  : monospace
mathtext.it  : serif:italic
mathtext.bf  : serif:bold
mathtext.sf  : sans
mathtext.fontset : cm
mathtext.fallback_to_cm : True
mathtext.default : it



On 16/04/12 10:50 PM, Michael Droettboom wrote:
What is the math string you are using?  I can't seem to reproduce this with:

   "$D_{40}\prime\prime$"

What are your math-related rcParams?

Mike

On 04/15/2012 08:53 PM, Alexander Wagner wrote:
Dear Matplotlib users,

Mathtext primed used to be rendered correctly in 1.0.0 like so



But now they look tiny and badly spaced in 1.1.0 like so



I haven't tried with all fonts, but it is the case with Bitstream Vera Sans and Helvetica. Can anyone confirm?

If I use the LaTeX renderer, it looks correct.

Many thanks,
Alex




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