Fix errorbar autoscaling inconsistency on log axes (#31478)

Vikash-Kumar-23 · web-flow · commit 4a1af9c1b70b · 2026-04-22T21:42:10.000-04:00
* Fix errorbar autoscaling inconsistency on log axes (fixes #31462) * Move log scale fix from _axes.py to collections.py root cause * Use single figure for log autoscale test * Fix formatting issues
diff --git a/lib/matplotlib/collections.py b/lib/matplotlib/collections.py
@@ -291,8 +291,11 @@ def get_datalim(self, transData):
             if isinstance(offsets, np.ma.MaskedArray):
                 offsets = offsets.filled(np.nan)
                 # get_path_collection_extents handles nan but not masked arrays
+            data_trf = transform.get_affine() - transData
+            if not data_trf.is_affine:
+                paths = [data_trf.transform_path_non_affine(p) for p in paths]
             return mpath.get_path_collection_extents(
-                transform.get_affine() - transData, paths,
+                data_trf.get_affine(), paths,
                 self.get_transforms(),
                 offset_trf.transform_non_affine(offsets),
                 offset_trf.get_affine().frozen())
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -4690,6 +4690,25 @@ def test_errorbar_limits():
     ax.set_title('Errorbar upper and lower limits')
 
 
+def test_errorbar_log_autoscale_order_independent():
+    x = 10 ** np.array([18, 18.1, 18.2, 18.3])
+    y = np.array([100, 80, 60, 30])
+    yerr = np.ones_like(y) * 10
+
+    fig, (ax1, ax2) = plt.subplots(2)
+
+    ax1.set_xscale("log")
+    ax1.set_yscale("log")
+    ax1.errorbar(x, y, yerr=yerr)
+
+    ax2.errorbar(x, y, yerr=yerr)
+    ax2.set_xscale("log")
+    ax2.set_yscale("log")
+
+    assert_allclose(ax1.get_xlim(), ax2.get_xlim())
+    assert_allclose(ax1.get_ylim(), ax2.get_ylim())
+
+
 def test_errorbar_nonefmt():
     # Check that passing 'none' as a format still plots errorbars
     x = np.arange(5)
