[gmx-users] velacc & box of water

Justin A. Lemkul jalemkul at vt.edu
Sun Oct 11 20:39:55 CEST 2009



Jamie Seyed wrote:
> Hi Justin,
> But this seems that did not change the number of molecule in the output 
> (only the volume and density are changing) and it seems that -maxsol has 
> not been used... my full command
> "genbox -cp spc216.gro -maxsol 500 -o out.gro -p topol.top -box 4 4 4"
> if I change 500 to any thing else the result is the same and changing 4 
> 4 4 to any thing else will change the volume and density...

When simultaneously specifying -maxsol and -box, the two must work in harmony. 
A smaller box may not fit 500 molecules, and trying a larger number of molecules 
may not fit in a fixed 4x4x4 nm box.  The command I used that worked was:

genbox -cs spc216.gro -maxsol 500 -o out.gro -box 5 5 5

Note that this gives a weird output configuration, probably because the box is 
not appropriate, but at least its a template of a command that should, in 
theory, work.

Alternatively, you can use the editconf/genbox combination to define a box and 
center the solute (which is water) with editconf -c, then fill the box with 
genbox, where -cp indeed specifies the solute (water) and provides solvent 
(water again!) with -cs.

-Justin

> I got confused... I appreciate any hint on that/Thanks/Jamie
> 
> On Sun, Oct 11, 2009 at 2:07 PM, Jamie Seyed <jamie.seyed at gmail.com 
> <mailto:jamie.seyed at gmail.com>> wrote:
> 
>     Thanks Justin,
>     As I understood -cp is for solute and -cs is for solvent... in this
>     case I thought that small created volume of water are plying as
>     solute... and then genbox should fill the box...
>     Anyways thank you :-)
> 
>     On Sun, Oct 11, 2009 at 2:01 PM, Justin A. Lemkul <jalemkul at vt.edu
>     <mailto:jalemkul at vt.edu>> wrote:
> 
> 
> 
>         Jamie Seyed wrote:
> 
>             Oh, I just changed the [-cs spc216.gro] to [-cp spc216.gro]
>             and this is working normally...??!! Do you have any idea?
> 
> 
>         Oops, I hadn't seen that before.  That is what you should do.
>          The -cp flag is the coordinate file that should have solvent
>         added to it, and that's what you're after, isn't it?
> 
>         -Justin
> 
>             On Sun, Oct 11, 2009 at 1:52 PM, Justin A. Lemkul
>             <jalemkul at vt.edu <mailto:jalemkul at vt.edu>
>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>> wrote:
> 
> 
> 
>                Jamie Seyed wrote:
> 
>                    I converted  spc216.pdb to gro using editconf. SO
>             they must be the
> 
> 
>                I suppose that's fine, I just don't see all the need for
>                interconverting file formats.  It just opens up the
>             possibility of
>                more errors if you don't keep track of what you're doing :)
> 
> 
>                    same(?). The version is 4.0.5 ...it was fine
>             before... yes ran
>                    it just now for fws tuto... how long it takes time in
>             your machine?
> 
> 
>                I have the same version.  The commands you showed
>             completed in just
>                a fraction of a second, like most simple solvation
>             procedures.
> 
>                -Justin
> 
> 
>                    On Sun, Oct 11, 2009 at 1:33 PM, Justin A. Lemkul
>                    <jalemkul at vt.edu <mailto:jalemkul at vt.edu>
>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>
>                    <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>
>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>>> wrote:
> 
> 
> 
>                       Jamie Seyed wrote:
> 
>                           Hi Justin,
>                           yes resize.gro is a created file from editconf
>             which has box
>                           size of  5.05918 on the last line
>                           my command was "editconf -bt cubic -f
>             spc216.pdb -o
>                    resize.gro -d 1"
> 
> 
>                       Do you actually have separate spc216.pdb and
>             spc216.gro
>                    files?  Just
>                       trying to make sure this actually worked.
> 
> 
>                           and for second command I changed 1 to 5 but it
>             still stops in
>                           the same point. I am trying to examine 2
>             methods that you
>                    & Mark
>                           suggested me to
> 
> 
>                       Very weird.  Both of your commands worked on my
>             machine.  What
>                       version of Gromacs are you using?  Does genbox
>             work for other
>                    systems?
> 
>                       -Justin
> 
>                           create a box of water.../Many Thanks/Jamie
> 
>                           On Sun, Oct 11, 2009 at 12:54 PM, Justin A. Lemkul
>                           <jalemkul at vt.edu <mailto:jalemkul at vt.edu>
>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>
>                    <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>
>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>>
>                           <mailto:jalemkul at vt.edu
>             <mailto:jalemkul at vt.edu> <mailto:jalemkul at vt.edu
>             <mailto:jalemkul at vt.edu>>
>                    <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>
>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>>>> wrote:
> 
> 
> 
>                              Jamie Seyed wrote:
> 
>                                  Dear Gmx users,
>                                  Does any one know why genbox stops when
>             I use this
>                    command:
>                                  "genbox -cp resize.gro -cs spc216.gro
>             -o b4em.pdb -p
>                           topol.top"
>                                  or when I use this command:
>                                  "genbox -cs spc216.gro -box 1 1 1
>             -maxsol 500 -o
>                    out.gro -p
>                                  topol.top"
>                                  It goes until
>                                  Reading solvent configuration
>                                  Solvent configuration contains 648
>             atoms in 216
>                    residues
>                                  and then stops....
>                                  Would you please let me know why it
>             happens?? Many
>                    Thanks in
>                                  Advance/Jamie
> 
> 
>                              Is "resize.gro" a new file?  Or something
>             you have
>                    created before
>                              (i.e., an empty file with a box size defined)?
> 
>                              Defining -box 1 1 1 generates a 1-nm cubic
>             box, which
>                    is almost
>                              certainly too small to contain 500 solvent
>             molecules.
>                     Define an
>                              appropriate box size.
> 
>                              -Justin
> 
> 
>                                   On Sun, Oct 11, 2009 at 12:04 PM,
>             Jamie Seyed
>                                  <jamie.seyed at gmail.com
>             <mailto:jamie.seyed at gmail.com>
>                    <mailto:jamie.seyed at gmail.com
>             <mailto:jamie.seyed at gmail.com>>
>             <mailto:jamie.seyed at gmail.com <mailto:jamie.seyed at gmail.com>
>                    <mailto:jamie.seyed at gmail.com
>             <mailto:jamie.seyed at gmail.com>>>
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>             <mailto:jamie.seyed at gmail.com>>
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>                    <mailto:jamie.seyed at gmail.com
>             <mailto:jamie.seyed at gmail.com>>>>
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>             <mailto:jamie.seyed at gmail.com>
>                    <mailto:jamie.seyed at gmail.com
>             <mailto:jamie.seyed at gmail.com>>>
>             <mailto:jamie.seyed at gmail.com <mailto:jamie.seyed at gmail.com>
>                    <mailto:jamie.seyed at gmail.com
>             <mailto:jamie.seyed at gmail.com>>
>                           <mailto:jamie.seyed at gmail.com
>             <mailto:jamie.seyed at gmail.com>
>                    <mailto:jamie.seyed at gmail.com
>             <mailto:jamie.seyed at gmail.com>>>>>>
> 
>                                  wrote:
> 
>                                     Thanks to Justin & Mark for
>             answering my second
>                           question...
>                                     Could any one give me a hint on my first
>                    question that
>                           I copy
>                                  it again?
>                                     --about g_velacc and calculating the
>             diffusion
>                           constant from
>                                  that.
>                                     In mailing list people say that we
>             need to
>                    divide it
>                           by mass
>                                  squared
>                                     and 1/3. Then I found another recent
>             post that
>                    said it
>                           has been
>                                     included in the code... Would you please
>                    clarify this
>                           that if
>                                  I need
>                                     the factors or not. Also I found 2
>             numbers after
>                           integration.
> 
>                                     Integral   1   0.01595
>                                     set    average
>                                     SS1   3.718082e-04
>                                     Would you please inform me what are
>             these
>                    number and
>                           what is the
>                                     relation between them?
>                                     Many Thanks in Advance/Jamie
> 
>                                     On Sat, Oct 10, 2009 at 8:39 PM,
>             Justin A. Lemkul
>                                  <jalemkul at vt.edu
>             <mailto:jalemkul at vt.edu> <mailto:jalemkul at vt.edu
>             <mailto:jalemkul at vt.edu>>
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>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>>
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>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>>>
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>             <mailto:jalemkul at vt.edu>
>                    <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>
>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>
>                    <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>>
>                           <mailto:jalemkul at vt.edu
>             <mailto:jalemkul at vt.edu> <mailto:jalemkul at vt.edu
>             <mailto:jalemkul at vt.edu>>
>                    <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>
>             <mailto:jalemkul at vt.edu <mailto:jalemkul at vt.edu>>>>>> wrote:
> 
> 
> 
>                                         Jamie Seyed wrote:
> 
>                                             Dear Gmx Users,
>                                             I have a 2 questions. First
>             about
>                    g_velacc and
>                                  calculating
>                                             the diffusion constant from
>             that. In
>                    mailing list
>                                  people say
>                                             that we need to divide it by
>             mass
>                    squared and
>                           1/3. Then I
>                                             found another recent post
>             that said it
>                    has been
>                                  included in
>                                             the code... Would you please
>             clarify
>                    this that
>                           if I
>                                  need the
>                                             factors or not. Also I found
>             2 numbers
>                    after
>                           integration.
>                                             Integral   1   0.01595
>                                             set    average
>                                             SS1   3.718082e-04
>                                             --1) Would you please inform
>             me what
>                    are these
>                           number and
>                                             what is the relation between
>             them?
>                                                                 Can't
>             comment on
>                    the first part...maybe the code will
>                                  point you
>                                         in the right direction?
> 
> 
>                                             --2) My second question is I
>             want to make a
>                           box of only
>                                             water (spce) with let say
>             500 water
>                    molecules.
>                           Would you
>                                             please give me quick hints
>             how to do it
>                    (the
>                           proper
>                                  way) or
>                                             refer me to good point? Up
>             to now I can
>                    only
>                           have 216
>                                  water
>                                             molecules from tuto/water
>             folder and I
>                    tried a lot
> 
> 
>                                         This task might be approached in
>             a couple
>                    of ways:
> 
>                                         1. genconf -nbox to define a
>             suitable number of
>                           replicate
>                                  systems.
>                                         2. genbox -box -maxsol 500 to
>             define a
>                           suitably-sized box and
>                                         fill it with only the desired
>             number of
>                    molecules.
> 
>                                         -Justin
> 
>                                             to start from the beginning,
>             but I
>                    could not
>                           make it... I
>                                             appreciate if you help me to
>             understand
>                    the first
>                                  issue and
>                                             be able to overcome the
>             second one.
>                    Many Thanks in
>                                  Advance/Jamie
> 
> 
>                                                              
>             ------------------------------------------------------------------------
> 
> 
> 
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> 
>                                         --              
>             ========================================
> 
>                                         Justin A. Lemkul
>                                         Ph.D. Candidate
>                                         ICTAS Doctoral Scholar
>                                         Department of Biochemistry
>                                         Virginia Tech
>                                         Blacksburg, VA
>                                         jalemkul[at]vt.edu
>             <http://vt.edu/> <http://vt.edu/>
>                    <http://vt.edu/>
>                           <http://vt.edu/> <http://vt.edu/> |
> 
>                                  (540) 231-9080
> 
>                                                    
>             http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
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>                                        
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>                              --    ========================================
> 
>                              Justin A. Lemkul
>                              Ph.D. Candidate
>                              ICTAS Doctoral Scholar
>                              Department of Biochemistry
>                              Virginia Tech
>                              Blacksburg, VA
>                              jalemkul[at]vt.edu <http://vt.edu/>
>             <http://vt.edu/> <http://vt.edu/>
>                    <http://vt.edu/> | (540)
>                           231-9080
>                            
>              http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
> 
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> 
>                       --    ========================================
> 
>                       Justin A. Lemkul
>                       Ph.D. Candidate
>                       ICTAS Doctoral Scholar
>                       Department of Biochemistry
>                       Virginia Tech
>                       Blacksburg, VA
>                       jalemkul[at]vt.edu <http://vt.edu/>
>             <http://vt.edu/> <http://vt.edu/> | (540)
>                    231-9080
>                      
>             http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
> 
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>                --    ========================================
> 
>                Justin A. Lemkul
>                Ph.D. Candidate
>                ICTAS Doctoral Scholar
>                Department of Biochemistry
>                Virginia Tech
>                Blacksburg, VA
>                jalemkul[at]vt.edu <http://vt.edu/> <http://vt.edu/> |
>             (540) 231-9080
>                http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
> 
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> 
>         -- 
>         ========================================
> 
>         Justin A. Lemkul
>         Ph.D. Candidate
>         ICTAS Doctoral Scholar
>         Department of Biochemistry
>         Virginia Tech
>         Blacksburg, VA
>         jalemkul[at]vt.edu <http://vt.edu/> | (540) 231-9080
>         http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
> 
>         ========================================
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> 

-- 
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

========================================



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