René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"UnicodeDecodeError when making a plot using the 'classic' style and text.usetex=True","articleBody":"### Bug report\r\n\r\nWhen making a plot using the 'classic' style, matplotlib overrides the default value for `text.latex.unicode`, setting it to `False`. This causes a problem for any plot that has negative numbers in any label, because matplotlib now uses a unicode symbol to represent the negative sign.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\nfrom matplotlib import rcParams\r\nrcParams['text.usetex'] = True\r\n\r\n# Example data\r\nt = np.arange(-1.0, 1.0 + 0.01, 0.01)\r\ns = np.cos(4 * np.pi * t) + 2\r\n\r\nplt.plot(t, s)\r\n\r\nwith plt.style.context('classic'):\r\n    plt.savefig('tex_demo')\r\n```\r\n\r\n**Actual outcome**\r\n\r\nThe following traceback:\r\n\r\n```\r\n  File \"test_mpl.py\", line 14, in \u003cmodule\u003e\r\n    plt.savefig('tex_demo')\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/pyplot.py\", line 707, in savefig\r\n    res = fig.savefig(*args, **kwargs)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/figure.py\", line 1763, in savefig\r\n    self.canvas.print_figure(*args, **kwargs)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/backend_bases.py\", line 2234, in print_figure\r\n    **kwargs)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/backends/backend_agg.py\", line 548, in print_png\r\n    FigureCanvasAgg.draw(self)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/backends/backend_agg.py\", line 467, in draw\r\n    self.figure.draw(self.renderer)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/artist.py\", line 68, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/figure.py\", line 1240, in draw\r\n    renderer, self, artists, self.suppressComposite)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/image.py\", line 139, in _draw_list_compositing_images\r\n    a.draw(renderer)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/artist.py\", line 68, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/axes/_base.py\", line 2386, in draw\r\n    mimage._draw_list_compositing_images(renderer, self, artists)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/image.py\", line 139, in _draw_list_compositing_images\r\n    a.draw(renderer)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/artist.py\", line 68, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/axis.py\", line 1118, in draw\r\n    tick.draw(renderer)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/artist.py\", line 68, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/axis.py\", line 268, in draw\r\n    self.label1.draw(renderer)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/artist.py\", line 68, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/text.py\", line 797, in draw\r\n    mtext=mtext)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/backends/backend_agg.py\", line 255, in draw_tex\r\n    Z = texmanager.get_grey(s, size, self.dpi)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/texmanager.py\", line 585, in get_grey\r\n    pngfile = self.make_png(tex, fontsize, dpi)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/texmanager.py\", line 508, in make_png\r\n    dvifile = self.make_dvi(tex, fontsize)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/texmanager.py\", line 400, in make_dvi\r\n    texfile = self.make_tex(tex, fontsize)\r\n  File \"/Users/goldbaum/Documents/matplotlib-git/lib/matplotlib/texmanager.py\", line 311, in make_tex\r\n    if rcParams['text.latex.unicode']:\r\nUnicodeEncodeError: 'ascii' codec can't encode character '\\u2212' in position 298: ordinal not in range(128)\r\n```\r\n\r\n**Expected outcome**\r\n\r\nThe plot should be saved to disk without erroring. The script runs without error on matplotlib 1.5.3.\r\n\r\n**Matplotlib version**\r\n\r\nMatplotlib 2.0.0 on OSX, installed via pip.\r\n\r\n","author":{"url":"https://github.com/ngoldbaum","@type":"Person","name":"ngoldbaum"},"datePublished":"2017-04-03T22:45:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/8423/matplotlib/issues/8423"}