René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ParasiteAxesAuxTrans  pcolor/pcolormesh and contour/contourf broken","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\n\r\n\u003c!--A short 1-2 sentences that succinctly describes the bug--\u003e\r\n\r\nCalling `pcolormesh`/`pcolor` or `contour`/`contourf` from a parasite axes created with `ParasiteAxesAuxTrans` breaks. In the call to create the mesh using `super_pcolor` (or `super_contour`) an additional `self` is added to the *args: https://github.com/matplotlib/matplotlib/blob/9a46926afd22be8df6d18d8a2aa58cde4348800a/lib/mpl_toolkits/axes_grid1/parasite_axes.py#L114\r\nThis breaks subsequent `pcolor`/`pcolormesh`/`pcontour`/`pcontourf` processing.\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required--\u003e\r\n\r\n```python\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\nfrom mpl_toolkits.axisartist import SubplotHost, ParasiteAxesAuxTrans\r\nfrom matplotlib.projections import PolarAxes\r\nfrom matplotlib.transforms import Affine2D\r\n\r\nfig = plt.figure(1, figsize=(7, 4))\r\nax1 = SubplotHost(fig, 1, 1, 1)\r\nfig.add_subplot(ax1)\r\ntr = Affine2D().scale(np.pi/180., 1.) + PolarAxes.PolarTransform()\r\nax2 = ParasiteAxesAuxTrans(ax1, tr, \"equal\")\r\nax1.parasites.append(ax2)\r\ndata = np.random.random((360,10))\r\nx = np.arange(data.shape[0])\r\ny = np.arange(data.shape[1])\r\nxx, yy = np.meshgrid(x, y)\r\nax2.pcolormesh(xx, yy, data.T)\r\nax1.set_xlim(-10, 10)\r\nax1.set_ylim(-10, 10)\r\nplt.show()\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n```\r\n---------------------------------------------------------------------------\r\nTypeError                                 Traceback (most recent call last)\r\n\u003cipython-input-1-3448b36e4131\u003e in \u003cmodule\u003e()\r\n     15 y = np.arange(data.shape[1])\r\n     16 xx, yy = np.meshgrid(x, y)\r\n---\u003e 17 ax2.pcolormesh(xx, yy, data.T)\r\n     18 ax1.set_xlim(-10, 10)\r\n     19 ax1.set_ylim(-10, 10)\r\n\r\n/home/kai/miniconda3/envs/wradlib/lib/python3.6/site-packages/mpl_toolkits/axes_grid1/parasite_axes.py in pcolormesh(self, *XYC, **kwargs)\r\n    120 \r\n    121     def pcolormesh(self, *XYC, **kwargs):\r\n--\u003e 122         return self._pcolor(super().pcolormesh, *XYC, **kwargs)\r\n    123 \r\n    124     def pcolor(self, *XYC, **kwargs):\r\n\r\n/home/kai/miniconda3/envs/wradlib/lib/python3.6/site-packages/mpl_toolkits/axes_grid1/parasite_axes.py in _pcolor(self, super_pcolor, *XYC, **kwargs)\r\n    114             gx = wxy[:, 0].reshape(orig_shape)\r\n    115             gy = wxy[:, 1].reshape(orig_shape)\r\n--\u003e 116             mesh = super_pcolor(self, gx, gy, C, **kwargs)\r\n    117             mesh.set_transform(self._parent_axes.transData)\r\n    118 \r\n\r\n/home/kai/miniconda3/envs/wradlib/lib/python3.6/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)\r\n   1783                         \"the Matplotlib list!)\" % (label_namer, func.__name__),\r\n   1784                         RuntimeWarning, stacklevel=2)\r\n-\u003e 1785             return func(ax, *args, **kwargs)\r\n   1786 \r\n   1787         inner.__doc__ = _add_data_doc(inner.__doc__,\r\n\r\n/home/kai/miniconda3/envs/wradlib/lib/python3.6/site-packages/matplotlib/axes/_axes.py in pcolormesh(self, alpha, norm, cmap, vmin, vmax, shading, antialiased, *args, **kwargs)\r\n   5957         allmatch = (shading == 'gouraud')\r\n   5958 \r\n-\u003e 5959         X, Y, C = self._pcolorargs('pcolormesh', *args, allmatch=allmatch)\r\n   5960         Ny, Nx = X.shape\r\n   5961         X = X.ravel()\r\n\r\n/home/kai/miniconda3/envs/wradlib/lib/python3.6/site-packages/matplotlib/axes/_axes.py in _pcolorargs(funcname, allmatch, *args)\r\n   5527         else:\r\n   5528             raise TypeError(\r\n-\u003e 5529                 'Illegal arguments to %s; see help(%s)' % (funcname, funcname))\r\n   5530 \r\n   5531         Nx = X.shape[-1]\r\n\r\nTypeError: Illegal arguments to pcolormesh; see help(pcolormesh)\r\n```\r\n\r\n**Expected outcome**\r\n\r\n\u003c!--A description of the expected outcome from the code snippet--\u003e\r\n\u003c!--If this used to work in an earlier version of Matplotlib, please note the version it used to work on--\u003e\r\n\r\n![parasite_axes](https://user-images.githubusercontent.com/5821660/46008820-1a28c980-c0be-11e8-90e8-72cd2cd7b8ad.png)\r\n\r\nWorks before PR #11678.\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: Linux\r\n  * Matplotlib version: 3.0.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: 3.6.6\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: \r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n\r\nRunning conda environment using conda-forge channel.\r\n\r\n","author":{"url":"https://github.com/kmuehlbauer","@type":"Person","name":"kmuehlbauer"},"datePublished":"2018-09-25T10:31:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/12265/matplotlib/issues/12265"}