Re: [gmx-users] TOP file question

2013-03-29 Thread Peter Eastman
Which version of the manual are you using? I recall the discussion on [pairs_nb] being absent in an older version, but manual section 5.3.4 in version 4.6.1 has lots of discussion on [pairs_nb]. I was looking at the 4.5.3 manual. I just downloaded the 4.6.1 manual, and I see it now

Re: [gmx-users] TOP file question

2013-03-29 Thread Peter Eastman
Ok, thanks. Peter On Mar 29, 2013, at 10:22 AM, Justin Lemkul jalem...@vt.edu wrote: On Fri, Mar 29, 2013 at 1:16 PM, Peter Eastman peast...@stanford.eduwrote: Which version of the manual are you using? I recall the discussion on [pairs_nb] being absent in an older version, but manual

Re: [gmx-users] TOP file question

2013-03-28 Thread Peter Eastman
). Is that correct? Thanks! Peter On Mar 28, 2013, at 4:20 AM, Justin Lemkul jalem...@vt.edu wrote: On 3/27/13 5:12 PM, Peter Eastman wrote: I'm implementing a TOP file reader, and I have a question about an ambiguity in the format. The [ pairs ] block lists atom pairs that should

Re: [gmx-users] TOP file question

2013-03-28 Thread Peter Eastman
3. If gen-pairs is yes, then generate parameters for all 1-2, 1-3, and 1-4 pairs for which we did not already find parameters in step 1 or 2 (regardless of whether or not a [pairs] line exists for a particular pair). Or rather, generate an [exclusions] record for each 1-2 and 1-3, and a

Re: [gmx-users] TOP file question

2013-03-28 Thread Peter Eastman
After further study of the documentation, I find myself getting more confused rather than less. I see that the [pairs] and [pairtypes] directives only specify LJ parameters, not Coulomb parameters. (There's a function type 2 for [pairs] that does include charges, but the manual says that

[gmx-users] TOP file question

2013-03-27 Thread Peter Eastman
I'm implementing a TOP file reader, and I have a question about an ambiguity in the format. The [ pairs ] block lists atom pairs that should be handled specially (exclusions and 1-4 interactions). In addition, the gen-pairs flag can indicate that pairs are generated automatically. But all