Merge pull request matplotlib#23931 from ZzN1NJ4/main

Raise ValueError on negative number inputs for set_aspect

Author: tacaswell

lib/matplotlib/axes/_base.py

@@ -1681,6 +1681,8 @@ def set_aspect(self, aspect, adjustable=None, anchor=None, share=False):
             aspect = 1
         if not cbook._str_equal(aspect, 'auto'):
             aspect = float(aspect)  # raise ValueError if necessary
+            if aspect <= 0 or not np.isfinite(aspect):
+                raise ValueError("aspect must be finite and positive ")
 
         if share:
             axes = {sibling for name in self._axis_names

lib/matplotlib/tests/test_axes.py

@@ -7569,6 +7569,18 @@ def test_bbox_aspect_axes_init():
     assert_allclose(sizes, sizes[0])
 
 
+def test_set_aspect_negative():
+    fig, ax = plt.subplots()
+    with pytest.raises(ValueError, match="must be finite and positive"):
+        ax.set_aspect(-1)
+    with pytest.raises(ValueError, match="must be finite and positive"):
+        ax.set_aspect(0)
+    with pytest.raises(ValueError, match="must be finite and positive"):
+        ax.set_aspect(np.inf)
+    with pytest.raises(ValueError, match="must be finite and positive"):
+        ax.set_aspect(-np.inf)
+
+
 def test_redraw_in_frame():
     fig, ax = plt.subplots(1, 1)
     ax.plot([1, 2, 3])