Re: [gmx-users] Free energy

2010-12-30 Thread Floris Buelens
The biotin-streptavidin interaction is on the order of -75 kJ/mol, so a binding free energy of -300 kJ/mol (dissociation constant of 10^-52 M) means something is fundamentally wrong - start by taking a hard look at your protocol, as convergence problems wouldn't account for that kind of deviatio

Re: [gmx-users] Fatal error:Chain identifier

2010-12-30 Thread ahmet yıldırım
Dear Justin, Firstly, Thanks for your help. You said "You're going from the end of chain B to the beginning of chain A, then back to B later on. Also realize that whatever "ABSG" or "BSG" is." How do you understand it? Where can I find such an important theoretical information? Thanks in advance

Re: [gmx-users] Fatal error:Chain identifier

2010-12-30 Thread Mark Abraham
On 30/12/2010 11:37 PM, ahmet yıldırım wrote: Dear Justin, Firstly, Thanks for your help. You said "You're going from the end of chain B to the beginning of chain A, then back to B later on. Also realize that whatever "ABSG" or "BSG" is." How do you understand it? Where can I find such an im

Re: [gmx-users] Desktop Freezes While Using mdrun-gpu

2010-12-30 Thread Szilárd Páll
Hi Solomon, Just stumbled upon your mail and I thought you could still use a answer to your question. First of all, as you've probably read on the Gromacs-GPU page, a) you need a high-performance GPU to achieve good performance (in comparison to the CPU) -- that's the reason for the strict compat

Re: Antw: [gmx-users] NaN error using mdrun-gpu

2010-12-30 Thread Szilárd Páll
Hi, I've never seen/had my hands on the Tesla T10 so I didn't know that's the name it reports. I'll fix this for the next release. Rest assured that on this hardware Gromacs-GPU should run just fine. On the other hand, your driver version is very strange: CUDA Driver Version = 4243455, while it s

[gmx-users] Reordering of water molecules with Na+ ions coordinates in xtc file

2010-12-30 Thread leila karami
Dear gromacs users My simulation system contains protein, dna, water molecules and Na+ ions respectively. I want to reorder water molecules with Na+ ions in final xtc file as at first 1-1867 complex (protein and dna) 1868 - 24085 SOL (water molecules) 24086 -

[gmx-users] Reordering of water molecules with Na+ ions coordinates in xtc file

2010-12-30 Thread chris . neale
Dear Leila: Perhaps I took the long way around, but I am not aware of any such tool. You can make custom modifications to things like trjconv as follows. !!! Please note: I didn't test this except to see that it compiles. You should run some analyses before and after switching the order t

Re: [gmx-users] Add gromacs forcefield w/ virtual site

2010-12-30 Thread Marcelo Silva
Thank you Chris for your answer: 1) The molecule has no net charge because the virtual site in the center of mass is a point charge twice the charge in the O atom. 2) Until now I've created 5 files but I don't know if I am doing the right thing: * forcefield.itp #define _FF_OXY [ defau

[gmx-users] Major code reorganization in git coming up

2010-12-30 Thread Erik Lindahl
Hi! We figured we'd celebrate the upcoming new year with some major changes in the git development branch, consisting primarily of C++ support and a more modular organization of files. This is a gradual process, so this mail is a bit of a warning-message that the master/development branch might

[gmx-users] Major code reorganization in git coming up

2010-12-30 Thread Erik Lindahl
Hi! We figured we'd celebrate the upcoming new year with some major changes in the git development branch, consisting primarily of C++ support and a more modular organization of files. This is a gradual process, so this mail is a bit of a warning-message that the master/development branch might

[gmx-users] Add gromacs forcefield w/ virtual site

2010-12-30 Thread chris . neale
Sorry Marcelo, that sounds like a job for an author ;) If nobody else chimes in, then I suggest that you do some testing and come back to the list with specific problems. As an analogy, you might look at how the virtual site is handled in tip4p in the absence of settle. Chris. -- original

[gmx-users] g_tune_pme big standard deviation in perf.out output

2010-12-30 Thread WU Yanbin
Dear GMXers, I'm simulating a SPC/E water box with the size of 4nm by 4nm by 4nm. The command "g_tune_pme" was used to find the optimal PME node numbers, Coulomb cutoff radius and grid spacing size. The following command is used: g_tune_pme -np 24 -steps 5000 -resetstep 500 ... rcoul=1.5nm, rvdw=

Re: [gmx-users] Add gromacs forcefield w/ virtual site

2010-12-30 Thread Mark Abraham
On 31/12/2010 5:03 AM, Marcelo Silva wrote: Thank you Chris for your answer: 1) The molecule has no net charge because the virtual site in the center of mass is a point charge twice the charge in the O atom. 2) Until now I've created 5 files but I don't know if I am doing the right thing: