Re: [gmx-users] g_rms alignment question

2012-12-04 Thread Tsjerk Wassenaar
Hi Jia, You can use trjconv for custom fitting, and then feed the fitted trajectory to g_rms, not using fitting there. Either that's using -nofit or -fit none. Cheers, Tsjerk On Tue, Dec 4, 2012 at 6:06 AM, Jia Xu xujia@gmail.com wrote: Dear gromacs users, I have a trajectory of

Re: [gmx-users] Energy estimations of the protein-ligand complexes

2012-12-04 Thread Mark Abraham
What components will that potential energy have? Mark On Mon, Dec 3, 2012 at 6:54 PM, James Starlight jmsstarli...@gmail.comwrote: Dear Gromacs Users! I'm simulating different complexes of the receptors with different ligands. For each complex I want to determine potential energy (not the

Re: [gmx-users] metal_ligand complex

2012-12-04 Thread Justin Lemkul
On 12/3/12 11:55 PM, tarak karmakar wrote: Thanks Justin Yah! We can run steered MD or Umbrella Pulling ( sampling) for this purpose. But one thing I am wondering that how to move the entire complex. In my model there are no covalent bond ( bonding info) between the metal and ligands. So how

Re: [gmx-users] g_rms alignment question

2012-12-04 Thread Justin Lemkul
On 12/4/12 3:10 AM, Tsjerk Wassenaar wrote: Hi Jia, You can use trjconv for custom fitting, and then feed the fitted trajectory to g_rms, not using fitting there. Either that's using -nofit or -fit none. The same can be done in one step by using an index file with g_rms and choosing that

Re: [gmx-users] g_tune_pme for multiple nodes

2012-12-04 Thread Chandan Choudhury
Dear Carsten and Florian, Thanks for you useful suggestions. It did work. I still have a doubt regarding the execution : export MPIRUN=`which mpirun` export MDRUN=/cm/shared/apps/gromacs/4.5.5/single/bin/mdrun_mpi_4.5.5 g_tune_pme_4.5.5 -np $NPROCS -s md0-200.tpr -c tune.pdb -x tune.xtc -e

Re: [gmx-users] g_tune_pme for multiple nodes

2012-12-04 Thread Carsten Kutzner
Hi Chandan, the number of separate PME nodes in Gromacs must be larger than two and smaller or equal to half the number of MPI processes (=np). Thus, g_tune_pme checks only up to npme = np/2 PME nodes. Best, Carsten On Dec 4, 2012, at 1:54 PM, Chandan Choudhury iitd...@gmail.com wrote:

Re: [gmx-users] g_tune_pme for multiple nodes

2012-12-04 Thread Chandan Choudhury
Hi Carsten, Thanks for the reply. If PME nodes for the g_tune is half of np, then if it exceeds the ppn of of a node, how would g_tune perform. What I mean if $NPROCS=36, the its half is 18 ppn, but 18 ppns are not present in a single node (max. ppn = 12 per node). How would g_tune function in

Re: [gmx-users] g_tune_pme for multiple nodes

2012-12-04 Thread Carsten Kutzner
On Dec 4, 2012, at 2:45 PM, Chandan Choudhury iitd...@gmail.com wrote: Hi Carsten, Thanks for the reply. If PME nodes for the g_tune is half of np, then if it exceeds the ppn of of a node, how would g_tune perform. What I mean if $NPROCS=36, the its half is 18 ppn, but 18 ppns are not

Re: [gmx-users] g_tune_pme for multiple nodes

2012-12-04 Thread Chandan Choudhury
On Tue, Dec 4, 2012 at 7:18 PM, Carsten Kutzner ckut...@gwdg.de wrote: On Dec 4, 2012, at 2:45 PM, Chandan Choudhury iitd...@gmail.com wrote: Hi Carsten, Thanks for the reply. If PME nodes for the g_tune is half of np, then if it exceeds the ppn of of a node, how would g_tune

Re: [gmx-users] strange lincs warning with version 4.6

2012-12-04 Thread sebastian
On 11/23/2012 08:29 PM, Szilárd Páll wrote: Hi, On Fri, Nov 23, 2012 at 9:40 AM, sebastian sebastian.wa...@physik.uni-freiburg.de wrote: Dear GROMCS user, I installed the git gromacs VERSION 4.6-dev-20121117-7a330e6-dirty on my local desktop Watch out, the dirty version suffix

[gmx-users] About construction of Cyclic peptide

2012-12-04 Thread vidhya sankar
Dear gromacs users I would Like to Construct a assembly of cyclic Peptide  Is there is Any On line server or Tools Available ? Or any other Package Available It would be helpful if somebody Assists me Thanks In Advanve -- gmx-users mailing listgmx-users@gromacs.org

Re: [gmx-users] strange lincs warning with version 4.6

2012-12-04 Thread Mark Abraham
2fs is normally considered too large a time step for stable integration with only bonds to hydrogen constrained, so your observation of non-reproducible LINCS warnings is not indicative of some other problem. Also, if you ran your CPU-only calculations with nstlist=25 then AFAIK this works fine,

Re: [gmx-users] strange lincs warning with version 4.6

2012-12-04 Thread sebastian
On 12/04/2012 05:09 PM, Mark Abraham wrote: 2fs is normally considered too large a time step for stable integration with only bonds to hydrogen constrained, so your observation of non-reproducible LINCS warnings is not indicative of some other problem. Sorry, but why is this whole setup

[gmx-users] Dihedral angle restraints

2012-12-04 Thread Antonia Mey
Dear Gromacs users, I have a question regarding position restraints on dihedral angles. I would like to restrain the positions of phi and psi dihedral angles and on top of that increase the potential barrier which needs to be over come in order to go from one conformation to the next. (I.e. I

Re: [gmx-users] strange lincs warning with version 4.6

2012-12-04 Thread Mark Abraham
I can't know why you observe things working, in part because you haven't said what's in this system :-) Pure inflexible water would be fine because the constraints setting doesn't matter to water. Moreover, whether integration issues cause things to crash can depend on non-reproducible numerical

Re: [gmx-users] strange lincs warning with version 4.6

2012-12-04 Thread Roland Schulz
On Tue, Dec 4, 2012 at 11:30 AM, sebastian sebastian.wa...@physik.uni-freiburg.de wrote: On 12/04/2012 05:09 PM, Mark Abraham wrote: 2fs is normally considered too large a time step for stable integration with only bonds to hydrogen constrained, so your observation of non-reproducible

[gmx-users] 9-oder cosine series of dihedral angle

2012-12-04 Thread Tom
Dear Gmx Developer and Users, *Is it possible for gromacs to use an 8-order or 9-oder cosine series for dihedral angle computations?* From the menue, (Page 125, the table of Intramolecular Interactions Definition) there is one -- interaction type directive # at. f. tp

Re: [gmx-users] strange lincs warning with version 4.6

2012-12-04 Thread Thomas Piggot
Hi Mark, I am not so sure regarding your point about a 2 fs timestep and constraints = hbonds. Typical bond vibration between heavy atoms has roughly a 20 fs period (see table I of the Feenstra et al. paper you mentioned previously), so a timestep of 2 fs should be fine with constraints =

Re: [gmx-users] Energy estimations of the protein-ligand complexes

2012-12-04 Thread James Starlight
Mark, I've told about estimation of the energy of the ligands compounds (small hormone-like compounds) embedded in the receptors binding pocket. In other words I want to simulate that ligands in water as well as in the receptor complex and compare it's potential energy values in both cases. From

Re: [gmx-users] strange lincs warning with version 4.6

2012-12-04 Thread Szilárd Páll
On Tue, Dec 4, 2012 at 5:09 PM, Mark Abraham mark.j.abra...@gmail.comwrote: 2fs is normally considered too large a time step for stable integration with only bonds to hydrogen constrained, so your observation of non-reproducible LINCS warnings is not indicative of some other problem. Also,

[gmx-users] Re: Build on OSX with 4.6beta1

2012-12-04 Thread Carlo Camilloni
Dear Szilárd, My cmake version in the 2.8.9. The error is Linking C shared library libgmx.dylib Undefined symbols for architecture x86_64: std::terminate(), referenced from: do_memtest(unsigned int, int, int) in libgpu_utils.a(gpu_utils_generated_gpu_utils.cu.o)

Re: [gmx-users] Coordinates problem

2012-12-04 Thread Justin Lemkul
On 12/4/12 1:37 PM, Marcelo Depolo wrote: Hi everyone! I'm running a protein-ligand simulation and i'm having a little problem with the ligand atoms coordinates. After I equilibrate the simulation box with counter-ions, i checked my ligand with VMD and it was ok. After a minimization

Re: [gmx-users] system is not well equilibrated -Reg

2012-12-04 Thread Justin Lemkul
On 12/4/12 1:20 PM, venkatesh s wrote: Respected Gromacs Peoples, i got following error in the step mdrun nvt 1 particles communicated to PME node 1 are more than 2/3 times the cut-off out of the domain decomposition cell of their charge group in

[gmx-users] results of md

2012-12-04 Thread mohammad agha
Dear Gromacs Specialists, I ran one system (to create of micelles) tow times. Time of creation of micelles was different in each run and for example if it has been created 5 micelles (in the end of simulation) in both of them but the number of molecules presence in micelles (aggregation

Re: [gmx-users] results of md

2012-12-04 Thread Justin Lemkul
On 12/4/12 3:57 PM, mohammad agha wrote: Dear Gromacs Specialists, I ran one system (to create of micelles) tow times. Time of creation of micelles was different in each run and for example if it has been created 5 micelles (in the end of simulation) in both of them but the number of

[gmx-users] results of md

2012-12-04 Thread mohammad agha
Dear Justin, Thank you very much from your response. It means that this problem is not important. Should I use -reprod option in running of md.mdp? I want to obtain micelles as monodisperse with identical Nagg(aggregation number) in the one simulation, but distribution of sizes is broad and it

Re: [gmx-users] results of md

2012-12-04 Thread Justin Lemkul
On 12/4/12 4:15 PM, mohammad agha wrote: Dear Justin, Thank you very much from your response. It means that this problem is not important. Should I use -reprod option in running of md.mdp? I want to obtain micelles as monodisperse with identical Nagg(aggregation number) in the one

Re: [gmx-users] Re: Build on OSX with 4.6beta1

2012-12-04 Thread Szilárd Páll
Hi Carlo, I think I know now what the problem is. The CUDA compiler, nvcc, uses a the host compiler to compile CPU code which is generated as C++ and therefore, a C++ compiler is needed. However, up until CUDA 5.0 nvcc did not recognize the Intel C++ compiler (icpc) and it would only accept icc