User defined force field for a polymer

Is it possible to know the commands to create a user defined PYS force field for a polymer.

" - Creates a field with name ‘polymer’ in build directory

- Will execute EMC when path is set correctly "

You can use the paragraph


in your EMC Setup script. I would need to know a bit more about your problem to help you further.

The paragraph for PYS force field was used, but the execution is stopped at the following stage:

EMC Setup v4.1.3 (April 7, 2022), (c) 2004-2022 Pieter J. in 't Veld
Info: reading script from “.\polymer.esh”

Info: force field type = “standard”
Info: force field name = “polymer”
Info: force field location = “.”
Info: build for LAMMPS script in “…/build”
Info: creating EMC build script “build.emc”
Info: assuming mol fractions
Info: creating field parameter file “polymer.prm”

The EMC Setup script is attached.
polymer.esh (1.6 KB)

I noted, that the attached polymer.esh contains an incorrect entry in




should be replaced by


The reported issue in version 4.1.3 of EMC Setup results from absence of upon creation of build.emc. A work-around is running your polymer.esh two times. The first time the above error will occur through a missing entry for loading in build.emc. Both force field files – polymer.prm and – are present the second time, which will run through upon execution of build.emc. This issue will be resolved in the next version of EMC Setup.