diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index 94b3f3b255b8..0ea95aed250a 100644
--- a/lib/matplotlib/axes/_base.py
+++ b/lib/matplotlib/axes/_base.py
@@ -3904,16 +3904,16 @@ def twinx(self):
"""
Create a twin Axes sharing the xaxis
- Create a twin of Axes for generating a plot with a shared
- x-axis but independent y-axis. The y-axis of self will have
- ticks on left and the returned axes will have ticks on the
- right. To ensure tick marks of both axis align, see
+ Create a new Axes instance with an invisible x-axis and an independent
+ y-axis positioned opposite to the original one (i.e. at right). The
+ x-axis autoscale setting will be inherited from the original Axes.
+ To ensure that the tick marks of both y-axes align, see
`~matplotlib.ticker.LinearLocator`
Returns
-------
- Axis
- The newly created axis
+ ax_twin : Axes
+ The newly created Axes instance
Notes
-----
@@ -3924,6 +3924,7 @@ def twinx(self):
ax2.yaxis.tick_right()
ax2.yaxis.set_label_position('right')
ax2.yaxis.set_offset_position('right')
+ ax2.set_autoscalex_on(self.get_autoscalex_on())
self.yaxis.tick_left()
ax2.xaxis.set_visible(False)
ax2.patch.set_visible(False)
@@ -3933,25 +3934,26 @@ def twiny(self):
"""
Create a twin Axes sharing the yaxis
- Create a twin of Axes for generating a plot with a shared
- y-axis but independent x-axis. The x-axis of self will have
- ticks on bottom and the returned axes will have ticks on the
- top.
+ Create a new Axes instance with an invisible y-axis and an independent
+ x-axis positioned opposite to the original one (i.e. at top). The
+ y-axis autoscale setting will be inherited from the original Axes.
+ To ensure that the tick marks of both x-axes align, see
+ `~matplotlib.ticker.LinearLocator`
Returns
-------
- Axis
- The newly created axis
+ ax_twin : Axes
+ The newly created Axes instance
Notes
- ------
+ -----
For those who are 'picking' artists while using twiny, pick
events are only called for the artists in the top-most axes.
"""
-
ax2 = self._make_twin_axes(sharey=self)
ax2.xaxis.tick_top()
ax2.xaxis.set_label_position('top')
+ ax2.set_autoscaley_on(self.get_autoscaley_on())
self.xaxis.tick_bottom()
ax2.yaxis.set_visible(False)
ax2.patch.set_visible(False)
diff --git a/lib/matplotlib/tests/baseline_images/test_axes/twin_autoscale.png b/lib/matplotlib/tests/baseline_images/test_axes/twin_autoscale.png
new file mode 100644
index 000000000000..922eeff5c43d
Binary files /dev/null and b/lib/matplotlib/tests/baseline_images/test_axes/twin_autoscale.png differ
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index dacbf6987423..57fd58040e69 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -145,6 +145,42 @@ def test_twinx_cla():
assert ax.yaxis.get_visible()
+@image_comparison(baseline_images=['twin_autoscale'], extensions=['png'])
+def test_twinx_axis_scales():
+ x = np.array([0, 0.5, 1])
+ y = 0.5 * x
+ x2 = np.array([0, 1, 2])
+ y2 = 2 * x2
+
+ fig = plt.figure()
+ ax = fig.add_axes((0, 0, 1, 1), autoscalex_on=False, autoscaley_on=False)
+ ax.plot(x, y, color='blue', lw=10)
+
+ ax2 = plt.twinx(ax)
+ ax2.plot(x2, y2, 'r--', lw=5)
+
+ ax.margins(0, 0)
+ ax2.margins(0, 0)
+
+
+@cleanup
+def test_twin_inherit_autoscale_setting():
+ fig, ax = plt.subplots()
+ ax_x_on = ax.twinx()
+ ax.set_autoscalex_on(False)
+ ax_x_off = ax.twinx()
+
+ assert ax_x_on.get_autoscalex_on()
+ assert not ax_x_off.get_autoscalex_on()
+
+ ax_y_on = ax.twiny()
+ ax.set_autoscaley_on(False)
+ ax_y_off = ax.twiny()
+
+ assert ax_y_on.get_autoscaley_on()
+ assert not ax_y_off.get_autoscaley_on()
+
+
@image_comparison(baseline_images=["minorticks_on_rcParams_both"], extensions=['png'])
def test_minorticks_on_rcParams_both():
fig = plt.figure()
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