Do You mean in the topol_cg.top?
..........
[ moleculetype ]
; Name            nrexcl
  P3HT               3
.........

to change 3 to 4 (to exclude 1-5 interaction) and call grompp as:

$ grompp -f -c -n -p topol_cg.top -o topol_excl.tpr

In this case i have two *.tpr files: topol.tpr for CG MD simulation
and topol_excl.tpr for "csg_stat". Now i have a question: where
exactly i should define that "csg_stat" must take topol_excl.tpr to
calculate RDF's and "mdrun" must take topol.tpr for the cg-
simulation.

On Mar 19, 1:19 am, Christoph Junghans <[email protected]> wrote:
> Hi Sergii
>
> Am 18. März 2012 14:22 schrieb chemistry <[email protected]>:> Hello dear 
> developers of votca!!!
>
> > I'm using votca-1.2.2 for "ibi" and i have question related to the
> > multi_g_rdf. Is it possible to exclude intramolecular (like 1-5 and
> > futher...) interactions from the RDF's and to count just
> > intermolecular interactions? Because i have additional hill on my rdf
> > which correspond to the 1-5 intramolecular interaction. Does it have a
> > big influence on the final set of the potentials?
>
> You have to generate a second tpr file with the required exclusions.
> Then call multi_g_rdf as:
> $ multi_g_rdf -e XX -8 -- -s topol_excl.tpr
>
> As a side remark, I would recommend using csg_stat instead of
> multi_g_rdf as it is much faster for bigger systems (grid search (N)
> instead of N**2 search).
> And it saves you mapping the trajectory to cg first as csg_stat has
> the functionality of csg_map build-in.
> $ csg_stat --cg map.xml --nt 8 --trj atomistic.xtc --top atomistic.tpr
> --options seetings.xml
> or use it on the cg trajectory
> $  csg_stat --nt 8 --trj cg.xtc --top cg.tpr --options seetings.xml
>
> Cheers,
>
> Christoph
>
>
>
> > Thanks a lot in advance for your response,
>
> > sincerely
> > Sergii
>
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>
> --
> Christoph Junghans
> Web:http://www.compphys.de

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