Re: [gmx-users] Free energy calculations and speed problems

2008-05-19 Thread Justin A. Lemkul
Thanks to everyone for the insights. I'll try running things with the cutoff and see how it goes. -Justin Quoting Michael Shirts <[EMAIL PROTECTED]>: > Hi, Justin- > > Have you considered -not- running PME in vacuo? If you set your > cutoffs and rlist large enough, then you can just run with

Re: [gmx-users] Free energy calculations and speed problems

2008-05-19 Thread Michael Shirts
Hi, Justin- Have you considered -not- running PME in vacuo? If you set your cutoffs and rlist large enough, then you can just run with simple cutoffs, and it should run -fst-. Of course, you should compare to the energy with PME -- if they are not equivalent, then you many need to go back an

Re: [gmx-users] Free energy calculations and speed problems

2008-05-19 Thread David Mobley
Yes, what he said. On Mon, May 19, 2008 at 3:00 PM, van Bemmelen <[EMAIL PROTECTED]> wrote: > Hi Justin, > > You shouldn't use PME in vacuo. Just use pbc=no and infinite (i.o.w.: no) > cutoffs. > > I'm not entirely sure why PME takes such a long time, but I can give a very > wild guess. It may hav

RE: [gmx-users] Free energy calculations and speed problems

2008-05-19 Thread van Bemmelen
Hi Justin, You shouldn't use PME in vacuo. Just use pbc=no and infinite (i.o.w.: no) cutoffs. I'm not entirely sure why PME takes such a long time, but I can give a very wild guess. It may have something to do with the fact that, if I remember correctly, the Fourier transform of one (or a few)

Re: [gmx-users] Re: Re: water distortion above bilayer

2008-05-19 Thread Alan Dodd
How about you try the different options, see what they do, and then decide for yourself how best to utilise them for whatever it is that you wish to do? - Original Message From: ANINDITA GAYEN <[EMAIL PROTECTED]> To: gmx-users@gromacs.org Sent: Monday, May 19, 2008 2:28:30 PM Subject:

[gmx-users] 3rd Annual CMM 'Users Meet Developers' Workshop on QM/MM Simulations

2008-05-19 Thread Robert Johnson
Dear Colleague. We cordially invite you to register for the: 3rd Annual CMM 'Users Meet Developers' Workshop on QM/MM Simulations August 21st to 23rd 2008 in Philadelphia, PA * Goals The primary goal of this annual workshop is to encourage communication between users and developers of

[gmx-users] Free energy calculations and speed problems

2008-05-19 Thread Justin A. Lemkul
Hi all, I'm running some free energy calculations (in vacuo and in solution) for a set of molecules I am trying to parameterize. All the molecules are fairly small, about 30-35 atoms in each. The solvated calculations go smoothly, and rather quickly (~5 hr/ns on two nodes). I am running into a

[gmx-users] Combining LJ & Buckingham?

2008-05-19 Thread ttrudeau
Is there a way within GROMACS to use both Buckingham and Lennard-Jones potentials in the same simulation? So for example water-water could be modelled with LJ and water-solute with Buckingham? ___ gmx-users mailing listgmx-users@gromacs.org http://ww

[gmx-users] Re: Re: water distortion above bilayer

2008-05-19 Thread ANINDITA GAYEN
How to be sure that the water is moving from the leaflet to the other leaflet? Can I see it from any analysis? How can i trace a water that is moving due to pbc and how to originate a pdb that will show the pdb that will be visually good for analysis (I am confused about the -pbc nojump and -pbc wh

RE: [gmx-users] [ angle_restraints_z ]

2008-05-19 Thread Berk Hess
Date: Sat, 17 May 2008 08:48:28 +0330 From: [EMAIL PROTECTED] To: gmx-users@gromacs.org Subject: [gmx-users] [ angle_restraints_z ] Hi all, There are atoms (a1 and a2) in my small molecule coordinate file that have the same z component: a1: atom#22 (x1,y1,60.231) a2: atom#45 (x2,y2,60.23

RE: [gmx-users] dipole momentum calculation in Gromacs/CPMD

2008-05-19 Thread Berk Hess
Hi, No dipole moments are transfered from CPMD to Gromacs. Berk. > Date: Sat, 17 May 2008 12:44:43 +0200 > From: [EMAIL PROTECTED] > To: gmx-users@gromacs.org > Subject: [gmx-users] dipole momentum calculation in Gromacs/CPMD > > > Dear all, > > Would some one please explain how the dipole

Re: [gmx-users] problem regarding energy minimization

2008-05-19 Thread Mark Abraham
sangeeta kundu wrote: Dear Sir, I want to minimize an average structure obtained from a simulation, by conjugate gradient method.. As this method is more efficient than steepest descent I am trying with this method. The minimization has gone smoothly with steepest descent and l