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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: linelengths parameter of Axes.eventplot does not accept delta units","articleBody":"### Bug summary\n\nBased on #27466, the `linelengths` parameter of `Axes.eventplot` does not accept delta units, such as `datetime.timedelta`. This should work, as `linelengths` is something similar to `width` in `bar`.\n\n### Code for reproduction\n\n```python\nfig, ax = plt.subplots(layout=\"constrained\")\r\n\r\nx_dates1 = np.array(\r\n    [datetime.datetime(2020, 6, 30), datetime.datetime(2020, 7, 22),\r\n     datetime.datetime(2020, 8, 3), datetime.datetime(2020, 9, 14),],\r\n    dtype=np.datetime64)\r\n\r\nnp.random.seed(19680801)\r\n\r\nstart_date = datetime.datetime(2020, 7, 1)\r\nend_date = datetime.datetime(2020, 10, 15)\r\ndate_range = end_date - start_date\r\n\r\ndates1 = start_date + np.random.rand(30) * date_range\r\ndates2 = start_date + np.random.rand(10) * date_range\r\ndates3 = start_date + np.random.rand(50) * date_range\r\n\r\ncolors = ['C1', 'C2', 'C3']\r\nlineoffsets = np.array([\r\n    datetime.datetime(2020, 7, 1),\r\n    datetime.datetime(2020, 7, 15),\r\n    datetime.datetime(2020, 8, 1)\r\n], dtype=np.datetime64)\r\nlinelengths = [datetime.timedelta(days=5), datetime.timedelta(days=2),\r\n               datetime.timedelta(days=3)]\r\n\r\nax.eventplot([dates1, dates2, dates3], colors=colors,\r\n             lineoffsets=lineoffsets, linelengths=linelengths)\n```\n\n\n### Actual outcome\n\n```pytb\r\nTraceback (most recent call last):\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/axis.py\", line 1766, in convert_units\r\n    ret = self.converter.convert(x, self.units, self)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/dates.py\", line 1829, in convert\r\n    return self._get_converter().convert(*args, **kwargs)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/dates.py\", line 1757, in convert\r\n    return date2num(value)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/dates.py\", line 449, in date2num\r\n    d = d.astype('datetime64[us]')\r\nValueError: Could not convert object to NumPy datetime\r\n\r\nThe above exception was the direct cause of the following exception:\r\n\r\nTraceback (most recent call last):\r\n  File \"/home/elliott/code/matplotlib/foo.py\", line 31, in \u003cmodule\u003e\r\n    ax.eventplot([dates1, dates2, dates3], colors=colors,\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/__init__.py\", line 1472, in inner\r\n    return func(\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/axes/_axes.py\", line 1353, in eventplot\r\n    lineoffsets, linelengths = self._process_unit_info(\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/axes/_base.py\", line 2566, in _process_unit_info\r\n    return [axis_map[axis_name].convert_units(data)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/axes/_base.py\", line 2566, in \u003clistcomp\u003e\r\n    return [axis_map[axis_name].convert_units(data)\r\n  File \"/home/elliott/code/matplotlib/lib/matplotlib/axis.py\", line 1768, in convert_units\r\n    raise munits.ConversionError('Failed to convert value(s) to axis '\r\nmatplotlib.units.ConversionError: Failed to convert value(s) to axis units: [datetime.timedelta(days=5), datetime.timedelta(days=2), datetime.timedelta(days=3)]\r\n```\n\n### Expected outcome\n\nThe plot should work, with some kind of date-based scale on the vertical axis.\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\na2a28093ba836366e7ff0c6f1edb4fd98b47a04d\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\ngit checkout","author":{"url":"https://github.com/QuLogic","@type":"Person","name":"QuLogic"},"datePublished":"2023-12-09T05:36:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/27479/matplotlib/issues/27479"}