René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: subplot_mosaic bug with empty_sentinel and sharey=True","articleBody":"### Bug summary\n\nWhen an empty sentinel is used at the beginning of a row, with the sharey option True, the tick labelling on the y-axis isn't shown.\n\n### Code for reproduction\n\n```python\nfrom matplotlib import pyplot as plt\r\nimport numpy as np\r\n\r\ndata = [ np.array( [ i for i in range( 100 ) ] ) , np.random.random( 100 ) ]\r\n\r\nfig1 = plt.figure()\r\n\r\n# create a mosaic with an empty_sentinel \r\n# at the END of the row. \r\n# 'sharey=True' works.\r\nsubplots = fig1.subplot_mosaic(\r\n        \"\"\"\r\n        AB.\r\n        CDE\r\n        \"\"\" , sharex = True , sharey = True )\r\n\r\nsubplots[ \"A\" ].plot( data[0] , data[1] )\r\nsubplots[ \"B\" ].plot( data[0] , data[1] )\r\nsubplots[ \"C\" ].plot( data[0] , data[1] )\r\nsubplots[ \"D\" ].plot( data[0] , data[1] )\r\nsubplots[ \"E\" ].plot( data[0] , data[1] )\r\n\r\nsubplots[ \"C\" ].set_xlabel( 'A variable' )\r\nsubplots[ \"D\" ].set_xlabel( 'A variable' )\r\nsubplots[ \"E\" ].set_xlabel( 'A variable' )\r\n\r\nsubplots[ \"A\" ].set_ylabel( 'Some data' )\r\nsubplots[ \"C\" ].set_ylabel( 'Some data' )\r\n\r\nplt.savefig( 'mosaic_working.pdf' )\r\n\r\n# create a mosaic with an empty_sentinel \r\n# at the start of the row. \r\n# 'sharey=True' DOESN'T work: the y ticks\r\n# are missing.\r\nfig2 = plt.figure()\r\n\r\nsubplots = fig2.subplot_mosaic(\r\n        \"\"\"\r\n        .AB\r\n        CDE\r\n        \"\"\" , sharey = True )\r\n\r\nsubplots[ \"A\" ].plot( data[0] , data[1] )\r\nsubplots[ \"B\" ].plot( data[0] , data[1] )\r\nsubplots[ \"C\" ].plot( data[0] , data[1] )\r\nsubplots[ \"D\" ].plot( data[0] , data[1] )\r\nsubplots[ \"E\" ].plot( data[0] , data[1] )\r\n\r\nsubplots[ \"C\" ].set_xlabel( 'A variable' )\r\nsubplots[ \"D\" ].set_xlabel( 'A variable' )\r\nsubplots[ \"E\" ].set_xlabel( 'A variable' )\r\n\r\nsubplots[ \"A\" ].set_ylabel( 'Some data' )\r\nsubplots[ \"C\" ].set_ylabel( 'Some data' )\r\n\r\nplt.savefig( 'mosaic_not_working.pdf' )\n```\n\n\n### Actual outcome\n\n[mosaic_working.pdf](https://github.com/matplotlib/matplotlib/files/10932054/mosaic_working.pdf)\r\n[mosaic_not_working.pdf](https://github.com/matplotlib/matplotlib/files/10932056/mosaic_not_working.pdf)\r\n\n\n### Expected outcome\n\nThe y-axis in the first subplot of the top row should have y ticks. \n\n### Additional information\n\n_No response_\n\n### Operating system\n\nOS\n\n### Matplotlib Version\n\n3.7.0\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n3.11\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/apicco","@type":"Person","name":"apicco"},"datePublished":"2023-03-09T13:29:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":14},"url":"https://github.com/25417/matplotlib/issues/25417"}