2017-05-24 14:11 GMT-06:00 M. Chakraborty <[email protected]>:
> I am trying to use the tabulated potential (for non-bonded interactions)
> obtained from force-matching to run coarse-grained simulation in gromacs. To
> obtain the topology file I have used csg_gmxtopol.  conf_cg.gro file was
> obtained by running csg_map. In order to use the tabulated potential for
> simulation, I have made the following changes to the mdp file:
> vdwtype = User
> coulombtype = User
> energygrps = A B
> energygrp_table = A A B B
>
>
> I must mention here that I have mapped methanol molecules into
> coarse-grained particles having two beads representation (A for CH3 and B
> for OH). When I run the command, gmx grompp -v -f cg_grompp.mdp -p cgtop.top
> -c conf_cg.gro, I get the following error:
> Fatal error:
> Syntax error - File cgtop.top, line 4
> Last line read:
> '[ moleculetype ]'
> Invalid order for directive moleculetype
>
> I am not sure what is going on here. I am attempting to run a coarse-grained
> simulation for the first time. It would be really helpful if someone can
> guide me to identify what is wrong with my approach.
The output of csg_gmxtopol is only meant as a template and "File still
needs to be modified by the user" (from --help output).

Can you post your cgtop.top and we might be able to help?

Christoph

>
> Thank You.
>
> M. Chakraborty
>
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-- 
Christoph Junghans
Web: http://www.compphys.de

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