a 816-1467 a 2563-1964 Are you sure about that last number? As it is less than the first in that group, 2563.
Another option is: chain 1 & r 61-101 chain 2 & r 69-94 After you run "gmx make_ndx" type "h" and instructions on how to use the functions within make_ndx will appear. Catch ya, Dr. Dallas Warren Drug Delivery, Disposition and Dynamics Monash Institute of Pharmaceutical Sciences, Monash University 381 Royal Parade, Parkville VIC 3052 dallas.war...@monash.edu --------------------------------- When the only tool you own is a hammer, every problem begins to resemble a nail. On Sat, 10 Aug 2019 at 18:03, sunyeping <sunyep...@aliyun.com> wrote: > Dear everyone, > > I am trying to select a set of atoms and create a gropu for this atom set > with make_ndx. > My protein has two identical identical chains, with each containing 110 > residues. I need to select residues61-101 in chain A and residues 69-94 in > chain B as a group. > The atom indexes for 61-101 in chain A are 816-1467, and the those for > residues 69-94 in chain B are 2563-1964. > I don't know what is the correct syntax for the atom selection. Could you > help me with that? > > Best regards. > -- > 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. > -- 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.