I am getting an “ERROR: Illegal fix addforce command” message, which implies I have a syntax error somewhere. Please help me find where I’m coding incorrectly.
Here’s a snippet of my code:
region gap block -5.0 5.0 -5.0 5.0 -10.0 10.0 units box
…
create_atoms 1 single 0 0 0 units box
group A type 1
…
fix A_field A addforce 0.0 0.0 0.01 region gap
I’ve tried naming my groups and regions differently to no avail. When I remove the “region gap” keywords, the code runs perfectly. I can provide more of my code as needed.
Thanks for any input,
Brian