added an isinit check in LinearSegmentedColormap.is_gray

jdh2358 · jdh2358 · commit 960c33ce0c2a · 2008-05-27T21:21:32.000Z
svn path=/trunk/matplotlib/; revision=5280
diff --git a/lib/matplotlib/colors.py b/lib/matplotlib/colors.py
@@ -501,6 +501,7 @@ def _init():
         raise NotImplementedError("Abstract class only")
 
     def is_gray(self):
+        if not self._isinit: self._init()
         return (np.alltrue(self._lut[:,0] == self._lut[:,1])
                     and np.alltrue(self._lut[:,0] == self._lut[:,2]))
 
