From 61300dd1da3fcfac8cdd6eca3427b11f95605710 Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Fri, 31 Jan 2014 22:36:30 -0500
Subject: [PATCH] ENH : improve error invalid error message for subplot

Closes #2098

If user passes in a not-three-digit integer, raise `ValueError`
instead of letting the error propagate up from much farther down
the stack
---
 lib/matplotlib/figure.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
index a485fdefc584..34f529ecb044 100644
--- a/lib/matplotlib/figure.py
+++ b/lib/matplotlib/figure.py
@@ -901,6 +901,10 @@ def add_subplot(self, *args, **kwargs):
 
         if len(args) == 1 and isinstance(args[0], int):
             args = tuple([int(c) for c in str(args[0])])
+            if len(args) != 3:
+                raise ValueError("Integer subplot specification must " +
+                                 "be a three digit number.  " +
+                                 "Not {n:d}".format(n=len(args)))
 
         if isinstance(args[0], SubplotBase):