Hi,
the manual mentions that with the option '-surf' no normalization is
done. So it's normal the RDF will inrease with larger distances, since
the further you'll go away from the protein, the bigger the spherical
shell is (from which the RDF for distance r is calculated) and the more
water molecules will be in this shell.
Because of this using the '-nopbc' option shouldn't change anything.
One thing which i find rather strange, is that for really high distances
the RDF goes down. Would have thought that with pbc the RDF should
increase all the time.
But i have no idea to perform a sensible normalization afterwards.
Greetings
Thomas
Am 13.05.2013 17:24, schrieb gmx-users-requ...@gromacs.org:
Dear Gmx Users,
I run long simulation of my protein with 50 small molecules in water.
I calculated the RDF (Protein - Water) using -surf mol and -rdf mol_com.
Please, take a look at my plot:
http://speedy.sh/tmJbD/rdf-P-W.png
Could you please, explain me why the second peak is so high? Shall I use
option -nopbc ?
How can I obtain the density [kg/m3] versus the distance? I wish to compare
it with RDF of Protein-Ligands so wish to use some normalization for them
to be comparable - peaks will be visible.
Steven
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