Sep 4, 2006 #1 S Shweta_S Member level 3 Joined Jun 20, 2006 Messages 59 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,288 Location Chennai Activity points 1,655 hi Check this https://ocw.mit.edu/ans7870/resources/Strang/strangtext.htm bye shweta