René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: set_theta_offset removes grid outline","articleBody":"### Bug summary\r\n\r\nWhen producing a polar plot, ``set_theta_offset`` removes the outer gridlines.\r\n\r\n### Code for reproduction\r\n\r\n```python\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\nfig, (ax1,ax2) = plt.subplots(1,2,subplot_kw=dict(projection='polar'))\r\n\r\nazis = np.radians(np.linspace(0,360,72)); r = np.linspace(0, 250, 250)\r\ndats = np.random.rand(250,72)\r\nX,Y=np.meshgrid(azis,r)\r\n\r\nfor ax in [ax1,ax2]:\r\n    ax.contourf(X,Y,dats,cmap=\"RdYlBu\")\r\n\r\nax2.set_theta_offset(1.570796327)\r\nplt.subplots_adjust(wspace=0.5)\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\nFirst axis has no \"set_theta_offset\", which means the plot starts at 90. Second axis has \"set_theta_offset\", which rotates the plot to start at 0, but it removes the black outline. \r\n\r\n![image](https://github.com/matplotlib/matplotlib/assets/41115380/42cb66b5-5df0-412e-a485-1d663f144cbf)\r\n\r\n\r\n### Expected outcome\r\n\r\nExpect ax2 above to have a black circular outline as in ax1.\r\n\r\n### Additional information\r\n\r\n_No response_\r\n\r\n### Operating system\r\n\r\nWindows\r\n\r\n### Matplotlib Version\r\n\r\n3.7.1\r\n\r\n### Matplotlib Backend\r\n\r\nmodule://matplotlib_inline.backend_inline\r\n\r\n### Python version\r\n\r\n3.11.3\r\n\r\n### Jupyter version\r\n\r\n6.5.4\r\n\r\n### Installation\r\n\r\nconda","author":{"url":"https://github.com/am-thyst","@type":"Person","name":"am-thyst"},"datePublished":"2023-10-02T13:10:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/26972/matplotlib/issues/26972"}