[gmx-users] positive potential energy

2011-12-29 Thread Zahra M
Hi dear all I'm simulating a system containing CNT, when I put CNT in a unit cell and want to run energy minimization in a vacuum, I encounter with such an error: The optimal PME mesh load for parallel simulations is below 0.5   and for highly parallel simulations between 0.25 and 0.33,   for

[gmx-users] Re: positive potential energy

2011-12-29 Thread Zahra M
Sorry ...I forget to announce that my potential energy is positive, is it logical? From: Zahra M s_zahra_mous...@yahoo.com To: gmx-users@gromacs.org gmx-users@gromacs.org Sent: Thursday, December 29, 2011 12:52 PM Subject: positive potential energy Hi dear

Re: [gmx-users] Re: positive potential energy

2011-12-29 Thread Mark Abraham
On 29/12/2011 8:24 PM, Zahra M wrote: Sorry ...I forget to announce that my potential energy is positive, is it logical? No. *From:* Zahra M s_zahra_mous...@yahoo.com *To:* gmx-users@gromacs.org gmx-users@gromacs.org

Re: [gmx-users] Re: Generating Pairs with a Buckingham Potential

2011-12-29 Thread Olivia Waring
Hi Mark, Thanks for your reply! I'm sorry, you're right, as far as I know the manual doesn't actually mention Buckingham pairs generation... but when I set gen-pairs to yes and run grompp, I get the following error: Generating pair parameters is only supported with LJ non-bonded interactions I

[gmx-users] g_analyze -ee

2011-12-29 Thread leila karami
Dear gromacs users I want to calculate error estimates using block averaging for output from g-dist (distance between donor atom of protein and acceptor atom of dna). I used g_analyze -f dist.xvg -ee there are 3 columns in output file. anyone give me more explain about these columns? how to

[gmx-users] shell molecular dynamics

2011-12-29 Thread michael zhenin
Hello, I would like to run a simulation using the shell option. I tried to restraint solvent molecules which were found within the range of 5-10 angstroms from the box center. I couldn't find any way to do so. I didn't find any information about this topic anywhere else i.e. GROMACS manual,

Re: [gmx-users] shell molecular dynamics

2011-12-29 Thread Mark Abraham
On 29/12/2011 9:43 PM, michael zhenin wrote: Hello, I would like to run a simulation using the shell option. I tried to restraint solvent molecules which were found within the range of 5-10 angstroms from the box center. I couldn't find any way to do so. I didn't find any

Re: [gmx-users] how to obtain error bar for plotting?

2011-12-29 Thread Tsjerk Wassenaar
Hey :) Just some side notes. Make sure to distinguish between 'statistical error' or 'standard error of the mean', which is a measure of how 'correct' your estimate of the average is, and the standard deviation or the variance, which is a measure of the natural spread. The latter is not an error!

[gmx-users] Re: gmx-users Digest, Vol 92, Issue 138

2011-12-29 Thread Zahra M
that error. thank you in advanced Bests -Zahra -- next part -- An HTML attachment was scrubbed... URL: http://lists.gromacs.org/pipermail/gmx-users/attachments/20111229/d842ec1a/attachment-0001.html -- Message: 3 Date: Thu, 29 Dec 2011 01:24:14 -0800

[gmx-users] what is a central structure

2011-12-29 Thread Yun Shi
Hello everyone, I am using g_cluster with gromos method to do some clustering, and by default, -cl writes the central structure of each cluster obtained. So I wonder what 'central structure' mean? Assuming that I cluster based on RMSD values relative to the starting conformation, and that I then

Re: [gmx-users] what is a central structure

2011-12-29 Thread Mark Abraham
On 30/12/2011 7:49 AM, Yun Shi wrote: Hello everyone, I am using g_cluster with gromos method to do some clustering, and by default, -cl writes the central structure of each cluster obtained. So I wonder what 'central structure' mean? Assuming that I cluster based on RMSD values relative to

Re: [gmx-users] Re: Generating Pairs with a Buckingham Potential

2011-12-29 Thread Mark Abraham
On 30/12/2011 5:30 AM, Olivia Waring wrote: Hi Mark, Thanks for your reply! I'm sorry, you're right, as far as I know the manual doesn't actually mention Buckingham pairs generation... but when I set gen-pairs to yes and run grompp, I get the following error: Generating pair parameters is

Re: [gmx-users] g_analyze -ee

2011-12-29 Thread Mark Abraham
On 30/12/2011 1:06 AM, leila karami wrote: Dear gromacs users I want to calculate error estimates using block averaging for output from g-dist (distance between donor atom of protein and acceptor atom of dna). I used g_analyze -f dist.xvg -ee there are 3 columns in output file. anyone give