René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Inconsistent Corner Masking w/ plot_surface","articleBody":"### Inconsistent Corner Masking w/ plot_surface\r\n\r\nplot_surface inconsistently corner masks and even may not plot certain values when given a non-rectangular array.\r\n\r\n\r\n```python\r\n\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\nimport matplotlib as mpl\r\nfrom mpl_toolkits.mplot3d import axes3d\r\n\r\nx = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]\r\ny = [1, 2, 3, 4, 5, 6, 7, 8]\r\n\r\nX, Y = np.meshgrid(x, y)\r\n\r\nmatrix = np.array([[np.nan, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],\r\n                    [np.nan, 1.0, 2.0, 3.0, 4.0, 4.0, 4.0, 3.0, 2.0, 1.0, 1.0],\r\n                    [np.nan, np.nan, 4.0, 5.0, 6.0, 8.0, 6.0, 5.0, 4.0, 3.0, np.nan],\r\n                    [np.nan, np.nan, 7.0, 8.0, 11.0, 12.0, 11.0, 8.0, 7.0, np.nan, np.nan],\r\n                    [np.nan, np.nan, 8.0, 9.0, 10.0, 16.0, 10.0, 9.0, 10.0, 7.0, np.nan],\r\n                    [np.nan, np.nan, np.nan, 12.0, 16.0, 20.0, 16.0, 12.0, 11.0, np.nan, np.nan],\r\n                    [np.nan, np.nan, np.nan, np.nan, 22.0, 24.0, 22.0, 20.0, 18.0, np.nan, np.nan],\r\n                    [np.nan, np.nan, np.nan, np.nan, np.nan, 28.0, 26.0, 25.0, np.nan, np.nan, np.nan]])\r\nmaskMat = np.ma.masked_invalid(matrix)\r\nprint(maskMat)\r\n\r\nfig = plt.figure()\r\nax = fig.gca(projection = '3d')\r\nnormC = mpl.colors.Normalize(vmax = maskMat.max(), vmin = maskMat.min())\r\ncolors = mpl.cm.plasma(normC(maskMat))\r\nsurf = ax.plot_surface(X, Y, maskMat, norm = normC)\r\nplt.show()\r\n```\r\n\r\n**Actual outcome**\r\nCorner masking only happens on the left and not on the right:\r\n![bug report](https://user-images.githubusercontent.com/13559019/74202642-85bef880-4c19-11ea-94c8-72d3d91989eb.png)\r\n\r\nA case where a point is dropped:\r\n![bug report II](https://user-images.githubusercontent.com/13559019/74202720-ca4a9400-4c19-11ea-9879-9bb4e3b9f066.png)\r\n\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**Expected outcome**\r\nCorner masking consistently, and/or a way to control it like in contourf\r\n\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: Windows 10\r\n  * Matplotlib version: 3.1.3\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): TkAgg\r\n  * Python version: 3.7.3\r\n  * Other libraries: Numpy 1.18.1\r\n\r\nMatplotlib was installed via PyCharm Community edition\r\n\r\n","author":{"url":"https://github.com/b0ndman","@type":"Person","name":"b0ndman"},"datePublished":"2020-02-11T00:36:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/16470/matplotlib/issues/16470"}