[gmx-users] Help for gmx enemat

[valerio di giulio]

Hi Peter,

I have already created  an index file with make_ndx in which I specify
what atoms are in DNA1 and DNA2 groups. Moreover the two groups
are present in the file topol.top. Indeed GROMACS doesn't produce any
error about the declaration of them in the file .mdp. I send you also my
topol.top file
for clarity:
.................................

; GROMACS topology
;
; Include the force field
#include "/amber03.ff/forcefield.itp"

; Include chain topologies
#include "topol1.itp"
#include "topol2.itp"

; Include water topology
#include "amber03.ff/tip4p.itp"

; Include generic ion topology
#include "amber03.ff/ions.itp"

[ system ]
Two all-AT in water

[ molecules ]
DNA1            1
DNA2            1
SOL         39390
NA               190
CL               146

.............................

Thanks,

Valerio

2016-01-13 20:40 GMT+01:00 Peter Stern <peter.stern at weizmann.ac.il>:

> I believe that you need to define which nucleotides are in each group DNA1
> and DNA2 using make_ndx, since those are not "default" groups.  I think
> that you can do this and then do an Metin -rerun just to define the new
> groups.
>
> Peter
>
> Sent from my iPad
>
> > On 13 בינו׳ 2016, at 20:53, valerio di giulio <digiuliovalerio at gmail.com>
> wrote:
> >
> > Hi,
> >
> > I have a problem with the use of "gmx enemat". I'm trying to calculate
> > the contribution of SH-LJ to the potential that exists between two DNA
> > strands with GROMACS 5.1.1. I've already got a Potential of Mean Force
> > doing an umbrella sampling.
> > For this reason I have already many files .edr each one linked to a
> window,
> > from
> > which I would like to extract the SH-LJ contribution but every time I use
> > "enemat" this is the output:
> >
> > ......................
> >
> > GROMACS:      gmx enemat, VERSION 5.1.1
> > Executable:   /usr/local/gromacs/bin/gmx
> > Data prefix:  /usr/local/gromacs
> > Command line:
> >  gmx enemat umbrella1e.edr -ljsr
> >
> > Opened ener.edr as single precision energy file
> > Will read groupnames from inputfile
> > Read 2 groups
> > group 0WARNING! could not find group Coul-SR:DNA1-DNA1 (0,0)in energy
> file
> > WARNING! could not find group LJ-SR:DNA1-DNA1 (0,0)in energy file
> > WARNING! could not find group Coul-SR:DNA1-DNA2 (0,1)in energy file
> > WARNING! could not find group LJ-SR:DNA1-DNA2 (0,1)in energy file
> > group 1WARNING! could not find group Coul-SR:DNA2-DNA2 (1,1)in energy
> file
> > WARNING! could not find group LJ-SR:DNA2-DNA2 (1,1)in energy file
> >
> > Will select half-matrix of energies with 0 elements
> > Last energy frame read 500 time  500.000
> > Will build energy half-matrix of 2 groups, 0 elements, over 501 frames
> > Segmentation fault (core dumped)
> >
> > ...........................
> >
> > Although I have written to the .mdp file:
> >
> > energygrps = DNA1 DNA2
> >
> > Thank you in advance,
> >
> > Valerio Di Giulio
> > --
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