René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Adding contour labels affects the shape of filled contours","articleBody":"### Bug summary\n\nThe shape of the filled contours changes unexpectedly when I add the contour labels by calling `axs[1].clabel(CS)`.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\nimport numpy as np\n\ndelta = 0.025\nx = np.arange(-3.0, 3.0, delta)\ny = np.arange(-2.0, 2.0, delta)\nX, Y = np.meshgrid(x, y)\nZ1 = np.exp(-X**2 - Y**2)\nZ2 = np.exp(-(X - 1)**2 - (Y - 1)**2)\nZ = (Z1 - Z2) * 2\n\nfig, axs = plt.subplots(2, 1)\naxs[0].contourf(X, Y, Z)\nCS = axs[1].contourf(X, Y, Z)\nlabels = axs[1].clabel(CS)\nplt.show()\n```\n\n### Actual outcome\n\n\u003cimg width=\"546\" height=\"413\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/9c8d4415-e78d-4abf-98d9-c2098cd7a37d\" /\u003e\n\n### Expected outcome\n\n\u003cimg width=\"546\" height=\"413\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/f91440cd-fbe6-4e0d-9663-2d857b9c3e05\" /\u003e\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n0.2.0.dev53938+unknown.gd5f597d3d.g0f46f27f5\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nNone","author":{"url":"https://github.com/williamlus","@type":"Person","name":"williamlus"},"datePublished":"2026-03-21T07:31:54.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/31344/matplotlib/issues/31344"}