----- Original Message -----
From: pawan raghav <pwnr...@gmail.com>
Date: Tuesday, August 17, 2010 20:14
Subject: [gmx-users] Essential Dynamics
To: gmx-users@gromacs.org

> Dear Tsjerk, >   > It will be helpful to me if you would like to solve my 
> problem I have already read your tutorial and so many papers but I am really 
> confused and thats why mail to you. So please answer me which will help me 
> lot to understand right concept.

Tsjerk has already suggested gently that he's not going to teach you in this 
forum. People here do not have the time and resources for extensive one-on-one 
assistance - they're all volunteers sharing their wisdom that was earned with 
hard work. His tutorial material is a good bridge from abstract PCA to the 
kinds of PCA used in analysis molecular simulations. However if you do not 
understand what the covariance matrix contains or what its dimensions should 
be, then you will struggle to use the tools effectively.

Please follow his advice and search for suitable teaching material. There's no 
substitute for sound background knowledge in generating results in which you 
and others can have confidence. Perhaps 
http://en.wikipedia.org/wiki/Principal_component_analysis is a good start, or 
even a beginner-level linear algebra or multivariate statistics text suitable 
for a first-year university student. A university library should have several 
such.

Mark
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