Make default arrow head width sensible

dmcdougall · dmcdougall · commit 74580918552c · 2013-03-29T21:32:01.000-05:00
Currently the default head width is too small to produce a visible arrow
head by default, so make it bigger.
diff --git a/lib/matplotlib/patches.py b/lib/matplotlib/patches.py
@@ -1021,7 +1021,7 @@ def __init__(self, x, y, dx, dy, width=0.001, length_includes_head=False,
 
         """
         if head_width is None:
-            head_width = 3 * width
+            head_width = 20 * width
         if head_length is None:
             head_length = 1.5 * head_width
 
