On 7/31/13 12:18 PM, George Patargias wrote:
Hi Justin

Yes, it does look like Fig. 8.3 in the manual if I choose the OW atoms as
the the two groups!

So there must be a problem with the choice water-water or SOL-SOL for RDF
groups.


Indeed there would, because then (with -rdf atom) you're calculating an RDF for all possible atom pairs when choosing whole molecules.

-Justin

> Many thanks!
>



On 7/31/13 10:49 AM, George Patargias wrote:
Hello

I am trying to calculate the RDF of water with water for a 10 ns MD of
pure SPC water simulation (3x3x3 nm box). I run g_rdf with the default
-rdf option (atom).

The problem is that the integration of the RDF curve up to the first
minimum yields a zero value which is obviously not right

Do you have any suggestions about this? Should I run g_rdf in a
different
way?


Impossible to tell without seeing the RDF itself.  If it doesn't look like
Figure 8.3 in the manual, then you've got a problem either with the
simulation
itself or the way the RDF was calculated.  If it does, then you've got a
problem
with how you're integrating the curve.

-Justin

--
==================================================

Justin A. Lemkul, Ph.D.
Postdoctoral Fellow

Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 601
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201

jalem...@outerbanks.umaryland.edu | (410) 706-7441

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Dr. George Patargias
Postdoctoral Researcher
Biomedical Research Foundation
Academy of Athens
4, Soranou Ephessiou
115 27
Athens
Greece

Office: +302106597568


--
==================================================

Justin A. Lemkul, Ph.D.
Postdoctoral Fellow

Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 601
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201

jalem...@outerbanks.umaryland.edu | (410) 706-7441

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