René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Doc]: add histogram as colorbar example","articleBody":"### Documentation Link\n\n_No response_\n\n### Problem\n\nMaking a colorbar histogram is a kinda popular visualization that's not difficult but I figure finnicky enough that it's worth adding an example to the gallery. \n\n### Suggested improvement\n\nI've got one here to explain what I mean but I'm making this an issue so that maybe someone who has a better example can have fun with this:\n\n![Image](https://github.com/user-attachments/assets/c0393ec5-64a8-406b-bb93-35851111bf6d)\n\n```python\nx = np.random.random(100).reshape(10,10)\ncounts, bins = np.histogram(x)\n\ncmap = plt.colormaps['viridis']\nnorm = mcolors.BoundaryNorm(bins, cmap.N)\n\nfig, ax = plt.subplots()\nim = ax.imshow(x, cmap=cmap, norm=norm)\ncbar = plt.colorbar(im)\n\ncax = ax.inset_axes([1.5, 0, .25, 1])\nmidpoints = bins[:-1] + np.diff(bins)/2\ncax.barh(midpoints, counts, height= 1/len(counts), color = cmap(norm(midpoints)))\ncax.set_yticks(bins)\ncax.margins(0)\ncax.spines[:].set_visible(False)\n```\n\nI'm making cax an inset_axes here mostly because a lot of the real use cases for this are maps where it's nice to have a lot of control on where to put the histogram. I figure this example should live in color. Would be even nicer with #26312 and colorizer 'cause then I think the syncing is managed.\n\n","author":{"url":"https://github.com/story645","@type":"Person","name":"story645"},"datePublished":"2025-05-07T20:18:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/30026/matplotlib/issues/30026"}