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Don't modify bottom argument in place in stacked histograms. #18465

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Merged
merged 1 commit into from
Sep 13, 2020
Merged

Don't modify bottom argument in place in stacked histograms. #18465

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2 changes: 1 addition & 1 deletion lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6665,7 +6665,7 @@ def hist(self, x, bins=None, range=None, density=False, weights=None,
color=c, **{bottom_kwarg: bottom})
patches.append(patch)
if stacked:
bottom[:] = m
bottom = m
boffset += dw

elif histtype.startswith('step'):
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6 changes: 6 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -3532,6 +3532,12 @@ def test_hist_stacked_bar():
ax.legend(loc='upper right', bbox_to_anchor=(1.0, 1.0), ncol=1)


def test_hist_barstacked_bottom_unchanged():
b = np.array([10, 20])
plt.hist([[0, 1], [0, 1]], 2, histtype="barstacked", bottom=b)
assert b.tolist() == [10, 20]


def test_hist_emptydata():
fig = plt.figure()
ax = fig.add_subplot(111)
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