diff --git a/lib/matplotlib/tests/baseline_images/test_axes/auto_numticks_log.png b/lib/matplotlib/tests/baseline_images/test_axes/auto_numticks_log.png
new file mode 100644
index 000000000000..248fb669c56a
Binary files /dev/null and b/lib/matplotlib/tests/baseline_images/test_axes/auto_numticks_log.png differ
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 737cff66647c..d4ba30e59d12 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -4418,9 +4418,19 @@ def test_adjust_numtick_aspect():
@image_comparison(baseline_images=["auto_numticks"], style='default',
extensions=['png'])
def test_auto_numticks():
+ # Make tiny, empty subplots, verify that there are only 3 ticks.
fig, axes = plt.subplots(4, 4)
+@image_comparison(baseline_images=["auto_numticks_log"], style='default',
+ extensions=['png'])
+def test_auto_numticks_log():
+ # Verify that there are not too many ticks with a large log range.
+ fig, ax = plt.subplots()
+ matplotlib.rcParams['axes.autolimit_mode'] = 'round_numbers'
+ ax.loglog([1e-20, 1e5], [1e-16, 10])
+
+
@cleanup
def test_broken_barh_empty():
fig, ax = plt.subplots()
diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
index 02109e8bd991..ff0a71d156d2 100644
--- a/lib/matplotlib/ticker.py
+++ b/lib/matplotlib/ticker.py
@@ -1639,8 +1639,11 @@ def set_params(self, **kwargs):
def _raw_ticks(self, vmin, vmax):
if self._nbins == 'auto':
- nbins = max(min(self.axis.get_tick_space(), 9),
- max(1, self._min_n_ticks - 1))
+ if self.axis is not None:
+ nbins = max(min(self.axis.get_tick_space(), 9),
+ max(1, self._min_n_ticks - 1))
+ else:
+ nbins = 9
else:
nbins = self._nbins
@@ -1757,15 +1760,19 @@ class LogLocator(Locator):
Determine the tick locations for log axes
"""
- def __init__(self, base=10.0, subs=(1.0,), numdecs=4, numticks=15):
+ def __init__(self, base=10.0, subs=(1.0,), numdecs=4, numticks=None):
"""
place ticks on the location= base**i*subs[j]
"""
+ if numticks is None:
+ if rcParams['_internal.classic_mode']:
+ numticks = 15
+ else:
+ numticks = 'auto'
self.base(base)
self.subs(subs)
- # this needs to be validated > 1 with traitlets
- self.numticks = numticks
self.numdecs = numdecs
+ self.numticks = numticks
def set_params(self, base=None, subs=None, numdecs=None, numticks=None):
"""Set parameters within this locator."""
@@ -1786,7 +1793,7 @@ def base(self, base):
def subs(self, subs):
"""
- set the minor ticks the log scaling every base**i*subs[j]
+ set the minor ticks for the log scaling every base**i*subs[j]
"""
if subs is None:
self._subs = None # autosub
@@ -1799,6 +1806,14 @@ def __call__(self):
return self.tick_values(vmin, vmax)
def tick_values(self, vmin, vmax):
+ if self.numticks == 'auto':
+ if self.axis is not None:
+ numticks = max(min(self.axis.get_tick_space(), 9), 2)
+ else:
+ numticks = 9
+ else:
+ numticks = self.numticks
+
b = self._base
# dummy axis has no axes attribute
if hasattr(self.axis, 'axes') and self.axis.axes.name == 'polar':
@@ -1836,12 +1851,14 @@ def tick_values(self, vmin, vmax):
subs = self._subs
stride = 1
- if not self.numticks > 1:
- raise RuntimeError('The number of ticks must be greater than 1 '
- 'for LogLocator.')
- # FIXME: The following was designed for integer division in py2.
- while numdec / stride + 1 > self.numticks:
- stride += 1
+
+ if rcParams['_internal.classic_mode']:
+ # Leave the bug left over from the PY2-PY3 transition.
+ while numdec / stride + 1 > numticks:
+ stride += 1
+ else:
+ while numdec // stride + 1 > numticks:
+ stride += 1
decades = np.arange(math.floor(vmin) - stride,
math.ceil(vmax) + 2 * stride, stride)
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