Fixed restraint

From: Shahid Qamar (
Date: Tue Jun 21 2005 - 17:56:09 CDT

I am trying to minimise my system while to keep the distance between two
atoms fixed.
I use the following commond

urestraint {
           dis (D1, 1, N9) (C, 2, C4) kf =20 ref = 5.2

but it gives me errorReason:

FATAL ERROR: error parsing config file
    while executing
    (file "cminres.txt" line 103)

Any idea how i can use these commands. What is wront i am doing in here.
I just want a script which helps to keep the distance between 2 atoms fixed.



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