Atom constraint in certain direction

From: Priyan Amaras (
Date: Thu Nov 05 2009 - 11:15:31 CST

Dear NAMD users,

I am a little confused about applying "constraints" in NAMD.
Anyone knows exactly what constraints do? I applied constraint
in the x and y-directions using

selectConstraints on
selectConstrX on
selectConstrY on
selectConstrZ off
conskfile input.pdb
conskcol O
consref input.pdb
consexp 2
constraintScaling 1.0

but the atoms moved in the x and y directions!

How do I prevent the movement of atoms in a certain direction
(say, x-direction) completely?

Any help would be appreciated.



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