Re: [gmx-users] How to deal with "non-zero total charge" problem in gromacs?

2019-08-01 Thread Dallas Warren
Well there's your problem! Don't ignore things like this, the software is giving you the warning for a reason. You are going to have to go through that process again, and fix the starting coordinate file you are using, or the processing, depending on which atoms are the ones missing. The residue

Re: [gmx-users] How to deal with "non-zero total charge" problem in gromacs?

2019-08-01 Thread sunyeping
I don't know where the non-integral charges come from. But When preparing the gro file from the initial PDB file (a protein-DNA complex), I got a information saying that there are 24 atoms missing in the structure, but I can't tell what are these atoms. Could you tell me how to fix the atom

Re: [gmx-users] How to deal with "non-zero total charge" problem in gromacs?

2019-08-01 Thread Dallas Warren
Go through the topologies, residue by residue, find where it deviates. Each residue should sum to an integer charge. Also look at how you generated the topology, actually steps involved, where the coordinate files came from etc. Somewhere a choice has been made, process performed that introduced

Re: [gmx-users] How to deal with "non-zero total charge" problem in gromacs?

2019-07-31 Thread sunyeping
-- From:Bratin Kumar Das <177cy500.bra...@nitk.edu.in> Sent At:2019 Aug. 1 (Thu.) 12:31 To:gromacs ; 孙业平 Subject:Re: [gmx-users] How to deal with "non-zero total charge" problem in gromacs? Hi, Yes you can use the (-maxwarn)

Re: [gmx-users] How to deal with "non-zero total charge" problem in gromacs?

2019-07-31 Thread Bratin Kumar Das
Hi, Yes you can use the (-maxwarn) flag to overcome the error. But better to optimize the starting structure to reduce the excess charge of your system. On Thu, Aug 1, 2019 at 9:35 AM sunyeping wrote: > Dear all, > > I am trying to do MD simulation with protein-DNA complex with gromacs. >

Re: [gmx-users] How to deal with "non-zero total charge" problem in gromacs?

2019-07-31 Thread Dallas Warren
http://manual.gromacs.org/documentation/current/user-guide/run-time-errors.html#system-has-non-zero-total-charge You will need to go through your topologies and work out why there is a non-zero charge like that. Catch ya, Dr. Dallas Warren Drug Delivery, Disposition and Dynamics Monash

[gmx-users] How to deal with "non-zero total charge" problem in gromacs?

2019-07-31 Thread sunyeping
Dear all, I am trying to do MD simulation with protein-DNA complex with gromacs. When using gmx grompp to generate the tpr file for energy minimization, I enconters a fatal error: Fatal error: Too many warnings (1). If you are sure all warnings are harmless, use the -maxwarn option. There are