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Merged
timhoffm merged 11 commits into from
Dec 27, 2025
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Merged

Handle single color for multiple datasets in hist #30867

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f959bb1
Handle single color for multiple datasets in `hist`
gapplef Dec 16, 2025
9b78318
Merge branch 'matplotlib:main' into main
gapplef Dec 17, 2025
cb711e9
Update what's new: handle single color for multiple datasets in hist
gapplef Dec 17, 2025
1f2bb9b
Update docstring: handle single color for multiple datasets in hist
gapplef Dec 17, 2025
79906bb
Update docstring to complies with the guidelines
gapplef Dec 17, 2025
f93ac2e
New test for ``hist()``: single color with multiple datasets.
gapplef Dec 18, 2025
d718961
simplify what's new: handle single color for multiple datasets in hist
gapplef Dec 18, 2025
2ec3689
refine the test: handle single color for multiple datasets in hist
gapplef Dec 23, 2025
b23371d
refine the test: handle single color for multiple datasets in hist
gapplef Dec 23, 2025
f8c47c6
refine the test: handle single color for multiple datasets in hist
gapplef Dec 25, 2025
9c5d72e
Fix spelling
timhoffm Dec 27, 2025
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5 changes: 5 additions & 0 deletions doc/release/next_whats_new/hist_color.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
``hist()`` supports a single color for multiple datasets
--------------------------------------------------------

It is now possible to pass a single *color* value to `~.Axes.hist()`. This
value is applied to all datasets.
5 changes: 5 additions & 0 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7326,6 +7326,9 @@ def hist(self, x, bins=None, range=None, density=False, weights=None,
Color or sequence of colors, one per dataset. Default (``None``)
uses the standard line color sequence.

.. versionadded:: 3.10
It is now possible to use a single color with multiple datasets.

label : str or list of str, optional
String, or sequence of strings to match multiple datasets. Bar
charts yield multiple patches per dataset, but only the first gets
Expand Down Expand Up @@ -7447,6 +7450,8 @@ def hist(self, x, bins=None, range=None, density=False, weights=None,
if color is None:
colors = [self._get_lines.get_next_color() for i in range(nx)]
else:
if mcolors.is_color_like(color):
color = [color]*nx
colors = mcolors.to_rgba_array(color)
if len(colors) != nx:
raise ValueError(f"The 'color' keyword argument must have one "
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9 changes: 9 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -2580,6 +2580,15 @@ def test_hist_zorder(histtype, zorder):
assert patch.get_zorder() == zorder


def test_hist_single_color_multiple_datasets():
data = [[0, 1, 2], [3, 4, 5]]
_, _, bar_containers = plt.hist(data, color='k')
for p in bar_containers[0].patches:
assert mcolors.same_color(p.get_facecolor(), 'k')
for p in bar_containers[1].patches:
assert mcolors.same_color(p.get_facecolor(), 'k')


def test_stairs_no_baseline_fill_warns():
fig, ax = plt.subplots()
with pytest.warns(UserWarning, match="baseline=None and fill=True"):
Expand Down
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