Clarify error when plot() args have bad shapes.

anntzer · anntzer · commit 880b06807f1b · 2015-12-02T23:38:25.000-08:00
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 (shape: {}) and y (shape: {}) must have same "
+                             "first dimension".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 (shape: {}) and y (shape: {}) can be no "
+                             "greater than 2-D".format(x.shape, y.shape))
 
         if x.ndim == 1:
             x = x[:, np.newaxis]
