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Fix incorrect deprecation warning #22719

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Mar 30, 2022
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4 changes: 2 additions & 2 deletions lib/matplotlib/category.py
Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,7 @@ def convert(value, unit, axis):
is_numlike = all(units.ConversionInterface.is_numlike(v)
and not isinstance(v, (str, bytes))
for v in values)
if is_numlike:
if values.size and is_numlike:
_api.warn_deprecated(
"3.5", message="Support for passing numbers through unit "
"converters is deprecated since %(since)s and support will be "
Expand Down Expand Up @@ -230,7 +230,7 @@ def update(self, data):
convertible = self._str_is_convertible(val)
if val not in self._mapping:
self._mapping[val] = next(self._counter)
if convertible:
if data.size and convertible:
_log.info('Using categorical units to plot a list of strings '
'that are all parsable as floats or dates. If these '
'strings should be plotted as numbers, cast to the '
Expand Down
9 changes: 9 additions & 0 deletions lib/matplotlib/tests/test_category.py
Original file line number Diff line number Diff line change
Expand Up @@ -307,6 +307,15 @@ def test_overriding_units_in_plot(fig_test, fig_ref):
assert y_units is ax.yaxis.units


def test_no_deprecation_on_empty_data():
"""
Smoke test to check that no deprecation warning is emitted. See #22640.
"""
f, ax = plt.subplots()
ax.xaxis.update_units(["a", "b"])
ax.plot([], [])


def test_hist():
fig, ax = plt.subplots()
n, bins, patches = ax.hist(['a', 'b', 'a', 'c', 'ff'])
Expand Down