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FIX: ensure errorbar creates line collection even with empty data #9709

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Merged
merged 1 commit into from
Nov 7, 2017
Merged

FIX: ensure errorbar creates line collection even with empty data #9709

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4 changes: 2 additions & 2 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3033,7 +3033,7 @@ def extract_err(err, data):
# select points without upper/lower limits in x and
# draw normal errorbars for these points
noxlims = ~(xlolims | xuplims)
if noxlims.any():
if noxlims.any() or len(noxlims) == 0:
yo, _ = xywhere(y, right, noxlims & everymask)
lo, ro = xywhere(left, right, noxlims & everymask)
barcols.append(self.hlines(yo, lo, ro, **eb_lines_style))
Expand Down Expand Up @@ -3082,7 +3082,7 @@ def extract_err(err, data):
# select points without upper/lower limits in y and
# draw normal errorbars for these points
noylims = ~(lolims | uplims)
if noylims.any():
if noylims.any() or len(noylims) == 0:
xo, _ = xywhere(x, lower, noylims & everymask)
lo, uo = xywhere(lower, upper, noylims & everymask)
barcols.append(self.vlines(xo, lo, uo, **eb_lines_style))
Expand Down
7 changes: 7 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -5402,3 +5402,10 @@ def test_polar_gridlines():

assert ax.xaxis.majorTicks[0].gridline.get_alpha() == .2
assert ax.yaxis.majorTicks[0].gridline.get_alpha() == .2


def test_empty_errorbar_legend():
fig, ax = plt.subplots()
ax.errorbar([], [], xerr=[], label='empty y')
ax.errorbar([], [], yerr=[], label='empty x')
ax.legend()