René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: clabel manual argument does not accept units","articleBody":"### Bug summary\r\n\r\nAs found in #27490, while `contour` does appear to allow units, if you pass manual label locations to the `manual` argument of `clabel, it will fail.\r\n\r\n### Code for reproduction\r\n\r\n```python\r\nimport datetime\r\n\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\n\r\n\r\n# Sample data for contour plot\r\ndates = [datetime.datetime(2023, 10, 1) + datetime.timedelta(days=i) for i in range(10)]\r\nx_start, x_end, x_step = -10.0, 5.0, 0.5\r\ny_start, y_end, y_step = 0, 10, 1\r\n\r\nx = np.arange(x_start, x_end, x_step)\r\ny = np.arange(y_start, y_end, y_step)\r\n\r\n# In this case, Y axis has dates\r\nX, Y = np.meshgrid(x, dates)\r\n\r\nrows = len(X)\r\ncols = len(X[0])\r\n\r\nz1D = np.arange(rows * cols)\r\nZ = z1D.reshape((rows, cols))\r\n\r\nfig, ax = plt.subplots()\r\nCS = ax.contour(X, Y, Z)\r\n\r\nax.clabel(CS, CS.levels, inline=True, fmt=dict(zip(CS.levels, dates)),\r\n          manual=[(x, y) for x, y in zip(x, dates)])\r\n```\r\n\r\n\r\n### Actual outcome\r\n```python\r\nTraceback (most recent call last):\r\n  File \"/home/elliott/code/matplotlib/clabel.py\", line 27, in \u003cmodule\u003e\r\n    ax.clabel(CS, CS.levels, inline=True, fmt=dict(zip(CS.levels, dates)),\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/axes/_axes.py\", line 6581, in clabel\r\n    return CS.clabel(levels, **kwargs)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/contour.py\", line 195, in clabel\r\n    self.add_label_near(x, y, inline, inline_spacing)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/contour.py\", line 553, in add_label_near\r\n    x, y = transform.transform((x, y))\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/transforms.py\", line 1508, in transform\r\n    res = self.transform_affine(self.transform_non_affine(values))\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/_api/deprecation.py\", line 297, in wrapper\r\n    return func(*args, **kwargs)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/transforms.py\", line 2422, in transform_affine\r\n    return self.get_affine().transform(values)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/transforms.py\", line 1797, in transform\r\n    return self.transform_affine(values)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/_api/deprecation.py\", line 297, in wrapper\r\n    return func(*args, **kwargs)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/transforms.py\", line 1868, in transform_affine\r\n    return affine_transform(values, mtx)\r\nTypeError: Cannot cast array data from dtype('O') to dtype('float64') according to the rule 'safe'\r\n```\r\n### Expected outcome\r\n\r\nLabels are added at spots corresponding to those given in `manual`.\r\n\r\n### Additional information\r\n\r\n_No response_\r\n\r\n### Operating system\r\n\r\n_No response_\r\n\r\n### Matplotlib Version\r\n\r\n589d3fbe13f0067a21804ab3f55ffeb07a839b90\r\n\r\n### Matplotlib Backend\r\n\r\n_No response_\r\n\r\n### Python version\r\n\r\n_No response_\r\n\r\n### Jupyter version\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\ngit checkout","author":{"url":"https://github.com/QuLogic","@type":"Person","name":"QuLogic"},"datePublished":"2023-12-16T00:14:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/27525/matplotlib/issues/27525"}