René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unexpected replacement of \\right) with exclamation point in MathTextParser output","articleBody":"This bug report originates from my attempts to [answer this question](http://stackoverflow.com/a/33000975/838992) on Stack Overflow.  Minimal example thanks to the [other answer there by Baptiste](http://stackoverflow.com/a/33002413/838992).\n\n---\n\nWith certain LaTeX strings, the right paranthesis indicates by `\\right)` is replaced with an exclamation point when passed to MathTextParser and rendered as a bitmap or png.  This behaviour appears to occur when the parantheses are around an expression comprising multiple layered fractions.  It does not occur if `\\right]` or `\\right\\}` are used\n\nThe minimal code to reproduce this is as follows:\n\n```\nimport matplotlib.mathtext as mt\n\ns = r'$\\left(\\frac{\\frac{\\frac{M}{I}}{N}}' \\\n     r'{\\frac{\\frac{B}{U}}{G}}\\right)$'\nparser = mt.MathTextParser(\"Bitmap\")\nfor size in range(1, 30):\n    filename = \"figure{0}.png\".format(size)\n    parser.to_png(filename, s, fontsize=size)\n```\n\nThis gives output like\n\n![Image with exclamation in](http://i.stack.imgur.com/3DVSa.png)\n\nInvestigations indicate that this occurs only for certain combinations of expression and font size, but the example given above seems to give the most consistent failure conditions.  It **may** be related to `dpi` in the rendering, however this has not yet been conclusively proven or disproven.\n","author":{"url":"https://github.com/rsnape","@type":"Person","name":"rsnape"},"datePublished":"2015-10-08T14:40:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":30},"url":"https://github.com/5210/matplotlib/issues/5210"}