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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: fill_between gives IndexError with numpy 1.24.0.dev","articleBody":"### Bug summary\n\nThere is a test in `astropy` that started breaking when using matplotlib + numpy 1.24.0.dev0+896.g5ecaf36cd . Same error using stable matplotlib and matplotlib from the nightly wheel.\r\n\r\nThe actual test is at https://github.com/astropy/astropy/blob/75f9b60b5521ed8dae08611ddf766c95ce421801/astropy/visualization/tests/test_units.py#L24 but I will give reproducible example without astropy below.\r\n\r\nExample log with the astropy failure: https://github.com/astropy/astropy/actions/runs/3198205490/jobs/5222440278\n\n### Code for reproduction\n\n```python\nimport matplotlib\r\nimport matplotlib.pyplot as plt\r\n\r\nmatplotlib.use('agg')\r\nplt.figure()\r\nplt.plot([1, 2, 3], [3, 4, 5], label='label')\r\nplt.plot([1.05, 2.10, 3.15], [3.050, 3.025, 3.010])\r\nplt.fill_between([1, 3], [3, 5], [3.050, 3.010])  # IndexError\n```\n\n\n### Actual outcome\n\n```\r\nFile .../matplotlib/pyplot.py:2514, in fill_between(x, y1, y2, where, interpolate, step, data, **kwargs)\r\n   2510 @_copy_docstring_and_deprecators(Axes.fill_between)\r\n   2511 def fill_between(\r\n   2512         x, y1, y2=0, where=None, interpolate=False, step=None, *,\r\n   2513         data=None, **kwargs):\r\n-\u003e 2514     return gca().fill_between(\r\n   2515         x, y1, y2=y2, where=where, interpolate=interpolate, step=step,\r\n   2516         **({\"data\": data} if data is not None else {}), **kwargs)\r\n\r\nFile .../matplotlib/__init__.py:1423, in _preprocess_data.\u003clocals\u003e.inner(ax, data, *args, **kwargs)\r\n   1420 @functools.wraps(func)\r\n   1421 def inner(ax, *args, data=None, **kwargs):\r\n   1422     if data is None:\r\n-\u003e 1423         return func(ax, *map(sanitize_sequence, args), **kwargs)\r\n   1425     bound = new_sig.bind(ax, *args, **kwargs)\r\n   1426     auto_label = (bound.arguments.get(label_namer)\r\n   1427                   or bound.kwargs.get(label_namer))\r\n\r\nFile .../matplotlib/axes/_axes.py:5335, in Axes.fill_between(self, x, y1, y2, where, interpolate, step, **kwargs)\r\n   5333 def fill_between(self, x, y1, y2=0, where=None, interpolate=False,\r\n   5334                  step=None, **kwargs):\r\n-\u003e 5335     return self._fill_between_x_or_y(\r\n   5336         \"x\", x, y1, y2,\r\n   5337         where=where, interpolate=interpolate, step=step, **kwargs)\r\n\r\nFile .../matplotlib/axes/_axes.py:5263, in Axes._fill_between_x_or_y(self, ind_dir, ind, dep1, dep2, where, interpolate, step, **kwargs)\r\n   5259 ind, dep1, dep2 = np.broadcast_arrays(\r\n   5260     np.atleast_1d(ind), dep1, dep2, subok=True)\r\n   5262 polys = []\r\n-\u003e 5263 for idx0, idx1 in cbook.contiguous_regions(where):\r\n   5264     indslice = ind[idx0:idx1]\r\n   5265     dep1slice = dep1[idx0:idx1]\r\n\r\nFile .../matplotlib/cbook/__init__.py:1333, in contiguous_regions(mask)\r\n   1330     return []\r\n   1332 # Find the indices of region changes, and correct offset\r\n-\u003e 1333 idx, = np.nonzero(mask[:-1] != mask[1:])\r\n   1334 idx += 1\r\n   1336 # List operations are faster for moderately sized arrays\r\n\r\nIndexError: too many indices for array: array is 0-dimensional, but 1 were indexed\r\n```\n\n### Expected outcome\n\nNo error.\n\n### Additional information\n\nOnly with numpy 1.24.0.dev0+896.g5ecaf36cd but not with stable numpy.\n\n### Operating system\n\nDebian or Ubuntu\n\n### Matplotlib Version\n\nstable or nightly\n\n### Matplotlib Backend\n\nagg\n\n### Python version\n\n3.10 and 3.11\n\n### Jupyter version\n\nN/A\n\n### Installation\n\npip","author":{"url":"https://github.com/pllim","@type":"Person","name":"pllim"},"datePublished":"2022-10-06T15:51:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/24106/matplotlib/issues/24106"}