Justin, Thanks for your reply to this and my previous post! I looked at my .mdp and found the following line actually restrict the atom positions.
; VARIOUS PREPROCESSING OPTIONS define = -DPOSRES I have another question on dihedral angle parameter definition. I will post in a separate message. I would appreciate it if you can help. Best Regards, decaiyu -- View this message in context: http://gromacs.5086.x6.nabble.com/Polymer-Relaxation-Issue-tp5013734p5013753.html Sent from the GROMACS Users Forum mailing list archive at Nabble.com. -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.