Merge pull request matplotlib#24991 from oscargus/sharedlogaxis

Fix issue with shared log axis

Author: greglucas

lib/matplotlib/tests/test_ticker.py

@@ -259,6 +259,19 @@ def test_tick_values_not_empty(self):
                                1.e+09, 2.e+09, 5.e+09])
         assert_almost_equal(ll.tick_values(1, 1e8), test_value)
 
+    def test_multiple_shared_axes(self):
+        rng = np.random.default_rng(19680801)
+        dummy_data = [rng.normal(size=100), [], []]
+        fig, axes = plt.subplots(len(dummy_data), sharex=True, sharey=True)
+
+        for ax, data in zip(axes.flatten(), dummy_data):
+            ax.hist(data, bins=10)
+            ax.set_yscale('log', nonpositive='clip')
+
+        for ax in axes.flatten():
+            assert all(ax.get_yticks() == axes[0].get_yticks())
+            assert ax.get_ylim() == axes[0].get_ylim()
+
 
 class TestNullLocator:
     def test_set_params(self):

lib/matplotlib/ticker.py

@@ -2404,7 +2404,8 @@ def nonsingular(self, vmin, vmax):
                 "log-scaled.")
             vmin, vmax = 1, 10
         else:
-            minpos = self.axis.get_minpos()
+            # Consider shared axises
+            minpos = min(axis.get_minpos() for axis in self.axis._get_shared_axis())
             if not np.isfinite(minpos):
                 minpos = 1e-300  # This should never take effect.
             if vmin <= 0: