And the index file? what is the point of inserting them as input for NPT and 
MD? They should be for the whole system, not certain groups, right? Kind 
Regards,Ahmed



      From: Justin Lemkul <jalem...@vt.edu>
 To: gmx-us...@gromacs.org 
 Sent: Sunday, February 4, 2018 4:20 PM
 Subject: Re: [gmx-users] Running long MD simulation
   


On 2/4/18 9:15 AM, Ahmed Mashaly wrote:
> Thanks Justin.
>
> I found this one:
> https://mailman-1.sys.kth.se/pipermail/gromacs.org_gmx-users/2018-January/118282.html
>
> Another question I have about using cpt
>
> I know checkpoint is important for continuing simulation, but I didn't know 
> that we have to use it also from nvt output to npt input and from npt output 
> to md input ... I was just using the output .gro as input for the next step 
> ... Is this a fatal mistake?

Checkpoint files are essential for exact continuations. Without them, 
you lose thermodynamic state information, precise velocities, etc. 
Always use a checkpoint.

> If I have to use it then I can use it with grompp -t prev_checkpoint.cpt or 
> with mdrun -cpi prev_checkpoint.cpt ... Would it be the same result?
>  

You only need to invoke grompp if changing something about the system - 
output settings, ensemble, use of restraints, etc. Otherwise, just 
extend via convert-tpr and mdrun -cpi.

-Justin

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Virginia Tech Department of Biochemistry

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