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 <jalem...@vt.edu <mailto:jalem...@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
        <jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@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.se...@gmail.com <mailto:jamie.se...@gmail.com>
        <mailto:jamie.se...@gmail.com <mailto:jamie.se...@gmail.com>>
               <mailto:jamie.se...@gmail.com
        <mailto:jamie.se...@gmail.com> <mailto:jamie.se...@gmail.com
        <mailto:jamie.se...@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
               <jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
                  <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@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/> |

               (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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