[gmx-users] Density profile

Ashutosh Akshay Shah ashah at aggies.ncat.edu
Fri Apr 29 17:09:07 CEST 2016


For question 1.
-b 500 gives a time average density for 500ps or 0.5ns. If you change it to
5000, it'll show the time average density for 5ns and the graph will be
much smoother.

Ashutosh Shah

On Friday, April 29, 2016, Alexander Alexander <alexanderwien2k at gmail.com>

> Dear Gromacs user,
> My system is a metal surface with thousands of Water molecule on it,
> normally surface(3 nm) is in the bottom of the box and the rest on top is
> water(6 nm). My target is to plot "density profile" of either WATER or OW
> or HW along to Z(Normal distance above solid surface); 5 ns NVT simulation
> applid.
> 1. "gmx density" has offered many options, I am not sure which I have to
> choose to do so for this system, so, what is the right command to get this
> density profile:
> Mine is below , would you please improve it? I do not know why mine is
> never like what I see in publications.
> gmx density -f nvt.trr -s nvt.tpr -n surf-sol.ndx -d Z -dens number -b 500
> -o HWdens.xvg
> 2. What is the "Relative density profile" which I see in some publications
> usually? Relative to what it is?
> 3. What is the difference between "radial distribution function" and
> "density profile" especially for such a goal?
> Thanks in advance,
> Regards,
> Alex
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