Group-ID in fix

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1

Dear Developers

I want to apply fix command to a molecule in my model, but I don’t know what is group-ID for my molecule? Is it res-ID in pdb? or other parameter in pdb file? Please help me!

Thanks

2

Dear Developers
I want to apply fix command to a molecule in my model, but I don't know
what is group-ID for my molecule? Is it res-ID in pdb? or other parameter
in pdb file? Please help me!

http://lammps.sandia.gov/doc/group.html