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plt.stairs: fix unit handling for orientation="horizontal" #31666

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plt.stairs: fix unit handling for orientation="horizontal" #31666

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8 changes: 6 additions & 2 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7827,8 +7827,12 @@ def stairs(self, values, edges=None, *,
if edges is None:
edges = np.arange(len(values) + 1)

edges, values, baseline = self._process_unit_info(
[("x", edges), ("y", values), ("y", baseline)], kwargs)
if orientation == "vertical":
edges, values, baseline = self._process_unit_info(
[("x", edges), ("y", values), ("y", baseline)], kwargs)
else:
edges, values, baseline = self._process_unit_info(
[("y", edges), ("x", values), ("x", baseline)], kwargs)
Comment on lines +7833 to +7835
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@story645 story645 May 13, 2026

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Since vertical is the default, should it be the fallback position? Or will this error out if an orientation besides horizontal or vertical is provided?

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@stiglers-eponym stiglers-eponym May 13, 2026

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I just followed the convention that is used in mpatches.StepPatch (in patches.py) to which orientation is passed. The current behavior is that any value that is not "vertical" will be interpreted like "horizontal".

One can of course change this behavior, but that was not my intention in this PR.

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@story645 story645 May 14, 2026

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I hear that that's a separate discussion. I'm also wondering why stairs has to do unit processing if it's being done inside the patch creation code. Is it cause of:

https://github.com/stiglers-eponym/matplotlib/blob/6bcc38ad70066c391e327884af8bf917975cfd3f/lib/matplotlib/axes/_axes.py#L7855-L7863

And if so can that information be populated from patch.get_data()?


patch = mpatches.StepPatch(values,
edges,
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