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Backport PR #23333: Fix errorbar handling of nan. #23344

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25 changes: 14 additions & 11 deletions lib/matplotlib/axes/_axes.py
Original file line number Diff line number Diff line change
Expand Up @@ -1060,13 +1060,14 @@ def hlines(self, y, xmin, xmax, colors=None, linestyles='solid',
lines.update(kwargs)

if len(y) > 0:
minx = min(xmin.min(), xmax.min())
maxx = max(xmin.max(), xmax.max())
miny = y.min()
maxy = y.max()

# Extreme values of xmin/xmax/y. Using masked_verts here handles
# the case of y being a masked *object* array (as can be generated
# e.g. by errorbar()), which would make nanmin/nanmax stumble.
minx = np.nanmin(masked_verts[..., 0])
maxx = np.nanmax(masked_verts[..., 0])
miny = np.nanmin(masked_verts[..., 1])
maxy = np.nanmax(masked_verts[..., 1])
corners = (minx, miny), (maxx, maxy)

self.update_datalim(corners)
self._request_autoscale_view()

Expand Down Expand Up @@ -1139,11 +1140,13 @@ def vlines(self, x, ymin, ymax, colors=None, linestyles='solid',
lines.update(kwargs)

if len(x) > 0:
minx = x.min()
maxx = x.max()
miny = min(ymin.min(), ymax.min())
maxy = max(ymin.max(), ymax.max())

# Extreme values of x/ymin/ymax. Using masked_verts here handles
# the case of x being a masked *object* array (as can be generated
# e.g. by errorbar()), which would make nanmin/nanmax stumble.
minx = np.nanmin(masked_verts[..., 0])
maxx = np.nanmax(masked_verts[..., 0])
miny = np.nanmin(masked_verts[..., 1])
maxy = np.nanmax(masked_verts[..., 1])
corners = (minx, miny), (maxx, maxy)
self.update_datalim(corners)
self._request_autoscale_view()
Expand Down
14 changes: 14 additions & 0 deletions lib/matplotlib/tests/test_axes.py
Original file line number Diff line number Diff line change
Expand Up @@ -3633,6 +3633,20 @@ def test_errorbar_linewidth_type(elinewidth):
plt.errorbar([1, 2, 3], [1, 2, 3], yerr=[1, 2, 3], elinewidth=elinewidth)


@check_figures_equal(extensions=["png"])
def test_errorbar_nan(fig_test, fig_ref):
ax = fig_test.add_subplot()
xs = range(5)
ys = np.array([1, 2, np.nan, np.nan, 3])
es = np.array([4, 5, np.nan, np.nan, 6])
ax.errorbar(xs, ys, es)
ax = fig_ref.add_subplot()
ys = np.array([1, 2, np.nan, np.nan, 3])
es = np.array([4, 5, np.nan, np.nan, 6])
ax.errorbar([0, 1], [1, 2], [4, 5])
ax.errorbar([4], [3], [6], fmt="C0")


@image_comparison(['hist_stacked_stepfilled', 'hist_stacked_stepfilled'])
def test_hist_stacked_stepfilled():
# make some data
Expand Down