From: Revthi Sanker (
Date: Sat Jun 21 2014 - 00:07:50 CDT

Dear all,
I am a beginner to tcl scripting. I am attempting to calculate the angle
between the "y" component of the principal axes of 2 domains. I have
calculated the principal axis with the help of the Orient package:

I would like to compute the angle between the 2nd ​component (y
component) of the axes now.

How can I use the value stored in $I to obtain this information?

Kindly provide your valuable suggestions in this regard.

M.S. Research Scholar
Computational Biophysics Lab
Department of Biotechnology
Indian Institute Of Technology, Madras