Fix Rigid Command with Lammps 2013.03

Dear Lammps Users,

I am PhD student in UCL. I am using Lammps 2013.03 to run a system of TIP4P/2005 water and methane

I would like to group some water oxygen atoms and CH4 molecule into a particle so that I think I should use “fix rigid” command.

However, when I type

group particle type 1 3

fix 1 particle rigid single

There is an error “ERROR: Invalid fix style (modify.cpp:700)”

Does anyone know how to use this command in the right way with Lammps version 2013.03?

Could you help me?

Thank you for your help.

I am looking forward to your reply.

Sincerely,

Anh

Dear Lammps Users,

I am PhD student in UCL. I am using Lammps 2013.03 to run a system of
TIP4P/2005 water and methane

I would like to group some water oxygen atoms and CH4 molecule into a
particle so that I think I should use "fix rigid" command.

However, when I type

group particle type 1 3

fix 1 particle rigid single

There is an error "ERROR: Invalid fix style (modify.cpp:700)"

Does anyone know how to use this command in the right way with Lammps
version 2013.03?

does your executable actually *include* the fix rigid command. the
error message hints that it doesn't.

Could you help me?

getting help for an outdated version of LAMMPS requires a very
compelling reason. the first recommendation is usually to update to
the current version.

axel.

In the current version, you have to include the “rigid” package
when you build to use fix rigid.

Steve