Add guard in autoscale against empty arrays.

erykoff · erykoff · commit fa79e3d6d53d · 2022-09-18T21:45:56.000-07:00
diff --git a/lib/matplotlib/colors.py b/lib/matplotlib/colors.py
@@ -1368,8 +1368,14 @@ def inverse(self, value):
     def autoscale(self, A):
         """Set *vmin*, *vmax* to min, max of *A*."""
         A = np.asanyarray(A)
-        self.vmin = A.min()
-        self.vmax = A.max()
+        # Ensure that A has non-zero size to compute min/max.
+        # Otherwise put in filler values.
+        if A.size:
+            self.vmin = A.min()
+            self.vmax = A.max()
+        else:
+            self.vmin = 0.0
+            self.vmax = 0.0
 
     def autoscale_None(self, A):
         """If vmin or vmax are not set, use the min/max of *A* to set them."""
