From: Revthi Sanker (
Date: Wed Feb 05 2014 - 08:05:55 CST

Dear Sir,
I am using the script to make the pca visualization plots
provided at:

I source the *.tcl in the vmd tk console and select the first frame and
last frame. After which, when I perform the action:

porcupineplot::Diff atomselect4766 atomselect4767

an error is generated stating:

running through 476 residues
can't read "colorScheme": no such variable

Kindly help me in this regard.

Thank you in advance.
Yours sincerely,

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