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DOC: reword non-monotonic cell center warning #18483

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Merged
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Sep 15, 2020
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DOC: reword non-monotonic cell center warning #18483

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11 changes: 5 additions & 6 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5579,12 +5579,11 @@ def _interp_grid(X):
if not (np.all(dX >= 0) or np.all(dX <= 0)):
cbook._warn_external(
f"The input coordinates to {funcname} are "
"not all either increasing or decreasing, "
"the automatically computed edges can "
"produce misleading results in this case. "
"It is recommended to supply the "
f"quadrilateral edges to {funcname}"
f" yourself. See help({funcname}).")
"interpreted as cell centers, but are not "
"monotonically increasing or decreasing. "
"This may lead to incorrectly calculated cell "
"edges, in which case, please supply "
f"explicit cell edges to {funcname}.")
X = np.hstack((X[:, [0]] - dX[:, [0]],
X[:, :-1] + dX,
X[:, [-1]] + dX[:, [-1]]))
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3 changes: 2 additions & 1 deletion lib/matplotlib/tests/test_axes.py
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Expand Up @@ -1180,7 +1180,8 @@ def test_pcolorargs():
y = [-10, 10]
X, Y = np.meshgrid(x, y)
Z = np.zeros(X.shape)
with pytest.warns(UserWarning, match="The input coordinates"):
with pytest.warns(UserWarning,
match='are not monotonically increasing or decreasing'):
ax.pcolormesh(X, Y, Z, shading='auto')


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