--- a/day1/session6.tex	Thu Nov 05 14:56:52 2009 +0530
+++ b/day1/session6.tex	Thu Nov 05 20:47:16 2009 +0530
@@ -347,7 +347,7 @@
 \begin{lstlisting}
 In []: def pend_int(initial, t):
   ....     theta, omega = initial
-  ....     g, L = -9.81, 0.2
+  ....     g, L = 9.81, 0.2
   ....     f=[omega, -(g/L)*sin(theta)]
   ....     return f
   ....