René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Hexbin with bins='log' doesn't handle zeros as described","articleBody":"### Bug summary\n\nThe `hexbin` documentation for the `bins` parameter says \"If 'log', use a logarithmic scale for the colormap. Internally, log_10(i+1) is used to determine the hexagon color. This is equivalent to norm=LogNorm().\" My understanding is that by using i+1 as the scaling, any bins with zero points in them should be mapped to log(1) = 0 and appear with the bottom color of the colorbar. Instead, these zero bins appear to be mapped to log(0) and appear as the \"bad\" color.\n\n### Code for reproduction\n\n```Python\nimport numpy as np\nimport matplotlib.pyplot as plt\n\nnp.random.seed(1)\nxs = np.random.random(100)\nys = np.random.random(100)\nplt.hexbin(xs, ys, bins='log', gridsize=10)\nplt.colorbar()\n```\n\n### Actual outcome\n\n\u003cimg width=\"587\" height=\"453\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/54e8bf16-8a88-4e2d-a80f-3d40e2b64f9a\" /\u003e\n\n### Expected outcome\n\nI would expect the output to look like this (though for this hacked-up example the colorbar tick labels leave something to be desired.\n`plt.hexbin(xs, ys, gridsize=10, C=C, reduce_C_function=lambda x: np.log10(1 + np.sum(x)), mincnt=-1)`\n\n\u003cimg width=\"548\" height=\"436\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/7fb10f36-135c-4c02-9be8-6de88f9842c5\" /\u003e\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nUbuntu\n\n### Matplotlib Version\n\n3.10.7\n\n### Matplotlib Backend\n\nqtagg\n\n### Python version\n\n3.12.8\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/svank","@type":"Person","name":"svank"},"datePublished":"2025-11-18T17:57:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/30764/matplotlib/issues/30764"}