René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Colormap + NoNorm only plots one color under `matplotlib` 3.5.0","articleBody":"### Bug summary\n\nMy aim is to plot a colormap with e.g. 5 discrete colors (with 5 ticks centered per color).\r\n\r\nUnder `matplotlib` 3.4.3, I got this working with the code snippet below using `NoNorm`; under 3.5.0, only one color is plotted.\r\n\r\nIs this a bug - or is my setup incorrect/unidiomatic and worked only by chance before?\n\n### Code for reproduction\n\n```python\nimport matplotlib.pyplot as plt\r\nfrom matplotlib import cm, colors\r\n\r\ndata = [1, 2, 3, 4, 5]\r\n\r\nfig, ax = plt.subplots(figsize=(6, 1))\r\nfig.subplots_adjust(bottom=0.5)\r\n\r\nnorm = colors.NoNorm(vmin=min(data), vmax=max(data))\r\ncmap = cm.get_cmap(\"viridis\", len(data))\r\ncbar = fig.colorbar(cm.ScalarMappable(norm=norm, cmap=cmap), cax=ax, orientation=\"horizontal\")\r\nprint(cbar.get_ticks())\n```\n\n\n### Actual outcome\n\n![image](https://user-images.githubusercontent.com/7207093/144764565-fdd2108a-4b81-434e-8de4-a56f7cc93436.png)\r\n\r\nThis _is_ the output under `matplotlib` 3.5.0.\n\n### Expected outcome\n\n![image](https://user-images.githubusercontent.com/7207093/144764559-9b4bb901-98d9-4574-b80f-ba6401867106.png)\r\n\r\nThis _was_ the output under `matplotlib` 3.4.3.\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nUbuntu\n\n### Matplotlib Version\n\n3.5.0\n\n### Matplotlib Backend\n\nmodule://matplotlib_inline.backend_inline\n\n### Python version\n\nPython 3.9.7\n\n### Jupyter version\n\n3.2.4\n\n### Installation\n\nconda","author":{"url":"https://github.com/dominiquesydow","@type":"Person","name":"dominiquesydow"},"datePublished":"2021-12-05T21:50:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/21870/matplotlib/issues/21870"}