Are you sure that type 4 is not already present to start with ?.
Arun
Thank you, Arun.
Of course, I am sure that there is no type 4 at beginning.
Actually Lammps says like this,
group Edges type 1
6000 atoms in group Edges
group NP type 2
1000 atoms in group NP
group Chains type 3
0 atoms in group Chains
group GP type 4
0 atoms in group GP
Also I could see that when type 1 were close to type 2, type 1 were trapped by type 2 and went around type 2 in using VMD.
Makoto
For your information, in the Input file I sent, to simplify the situation, polymers are composed of 1 bead (type 1).
So Lammps says,
group Chains type 3
0 atoms in group Chains.
Makoto