[gmx-users] g_sas question

2015-01-19 Thread Eric Smoll
Hello, I am using the Gromacs 4.6.5 g_sas tool with custom radii for each atom as specified with a local vdwradii.dat file. Are the surface areas reported in -or atomarea.xvg on a sphere defined by R_VDW or at R_VDW + R_probe? Similarly, is the -minarea # flag a threshold value that applies to

Re: [gmx-users] tabulated non-bonded potentials with replica exchange (potentials that change with temperature)

2015-01-19 Thread Mark Abraham
On Mon, Jan 19, 2015 at 12:39 AM, Christopher Neale chris.ne...@alum.utoronto.ca wrote: Dear Users: I presume that I can use tabulated non-bonded potentials with replica exchange in gromacs 4.6.7. Indeed, I can think of no reason why not (modulo that there's only support for those in the

[gmx-users] how does PME auto-tuning work

2015-01-19 Thread Jiaqi Lin
Dear GROMACS users and developers, In GMX 4.6 or up, 'mdrun' can automatically adjust direct and reciprocal part of PME calculation to boost up speed. But how does it actually implemented in the code? I tried to manually set PME cutoff and fourierspacing but get different result. Can

Re: [gmx-users] Dihedral pca

2015-01-19 Thread ruchi lohia
Hi Pratibha If you make the index file with only the backbone atoms the dangle.trr file generated from g_angle -f foo.xtc -s foo.tpr -n dangle.ndx -or dangle.trr -type dihedral Gives you only the sine and cosine of backbone phi and psi dihedral angles . You can check for it by converting your

[gmx-users] how does PME auto-tuning work

2015-01-19 Thread Jiaqi Lin
Dear GROMACS developers, In GMX 4.6 or up, 'mdrun' can automatically adjust direct and reciprocal part of PME calculation to boost up speed. But how does it actually implemented in the code? I tried to manually set PME cutoff and fourierspacing but get different result. Can someone explain

[gmx-users] how does PME auto-tuning work

2015-01-19 Thread Jiaqi Lin
Dear GROMACS users and developers, In GMX 4.6 or up, 'mdrun' can automatically adjust direct and reciprocal part of PME calculation to boost up speed. But how does it actually implemented in the code? I tried to manually set PME cutoff and fourierspacing but get different result. Can

[gmx-users] how does PME auto-tuning work

2015-01-19 Thread Jiaqi Lin
Dear GROMACS developers, In GMX 4.6 or up, 'mdrun' can automatically adjust direct and reciprocal part of PME calculation to boost up speed. But how does it actually implemented in the code? I tried to manually set PME cutoff and fourierspacing but get different result. Can someone explain

[gmx-users] how does PME auto-tuning work

2015-01-19 Thread Jiaqi Lin
Dear GROMACS users and developers, In GMX 4.6 or up, 'mdrun' can automatically adjust direct and reciprocal part of PME calculation to boost up speed. But how does it actually implemented in the code? I tried to manually set PME cutoff and fourierspacing but get different result. Can

Re: [gmx-users] results produced by auto-tuning of Coulomb cut-off/grid for PME can not be reproduced by manually setting the Coulomb cut-off and grid spacing

2015-01-19 Thread Mark Abraham
On Thu, Jan 15, 2015 at 3:21 AM, Jiaqi Lin jq...@mit.edu wrote: Dear GMX developers, I've encounter a problem in GROMACS concerning the auto-tuning feature of PME that bugged me for months. As stated in the title, the auto-tuning feature of mdrun changed my coulomb cutoff from 1.4 nm to ~3.3