Merge pull request #5607 from anntzer/clarify-bad-shape-error

tacaswell · tacaswell · commit 2f65b5bd5582 · 2015-12-04T19:23:34.000-05:00
ENH: Clarify error when plot() args have bad shapes.
diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
@@ -220,9 +220,11 @@ def _xy_from_xy(self, x, y):
         x = _check_1d(x)
         y = _check_1d(y)
         if x.shape[0] != y.shape[0]:
-            raise ValueError("x and y must have same first dimension")
+            raise ValueError("x and y must have same first dimension, but "
+                             "have shapes {} and {}".format(x.shape, y.shape))
         if x.ndim > 2 or y.ndim > 2:
-            raise ValueError("x and y can be no greater than 2-D")
+            raise ValueError("x and y can be no greater than 2-D, but have "
+                             "shapes {} and {}".format(x.shape, y.shape))
 
         if x.ndim == 1:
             x = x[:, np.newaxis]
