twinx and twiny inherit autoscale setting for shared axis from parent Axes

naoyak · naoyak · commit b01c31dd1b8b · 2017-01-23T14:57:46.000-08:00
diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
@@ -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)
@@ -3952,6 +3953,7 @@ def twiny(self):
         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/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -145,6 +145,24 @@ def test_twinx_cla():
     assert ax.yaxis.get_visible()
 
 
+@cleanup
+def test_twin_inherit_autoscale():
+    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()
