tahereh tekieh wrote:
but it over writes on the previous status.


Not if you use the right input. Insert your first ion type with genion, update the topology, generate a new .tpr file and insert your second ion type, etc. If you use the same .tpr file (containing only solvent) for each addition, you essentially re-set the system of interest back to solvent-only. If you make changes to the system, those have to be accounted for.

-Justin

On Wed, May 19, 2010 at 2:12 PM, Thomas Schlesier <schl...@uni-mainz.de <mailto:schl...@uni-mainz.de>> wrote:

    Use genion multiple times.
    If you want to insert Na+ and K+, then first use genion with one and
    then with the other ion.

    Greetings
    Thomas



    Message: 5
    Date: Wed, 19 May 2010 11:37:09 +0430

    From: tahereh tekieh <golesan...@gmail.com
    <mailto:golesan...@gmail.com>>
    Subject: Re: [gmx-users] water medium
    To: jalem...@vt.edu <mailto:jalem...@vt.edu>, Discussion list for
    GROMACS users
           <gmx-users@gromacs.org <mailto:gmx-users@gromacs.org>>
    Message-ID:
           <aanlktikvksqelk-hu04toj6a_fg2iqwrlcx0xj_jn...@mail.gmail.com
    <mailto:aanlktikvksqelk-hu04toj6a_fg2iqwrlcx0xj_jn...@mail.gmail.com>>
    Content-Type: text/plain; charset="iso-8859-1"


    but genion only accepts one type of ion, how can we insert different
    types?

    On Tue, May 18, 2010 at 3:38 PM, Justin A. Lemkul <jalem...@vt.edu
    <mailto:jalem...@vt.edu>> wrote:

     > >
     > >
     > > tahereh tekieh wrote:
     > >
     >> >> dear friends
     >> >> i want to simulate a water medium in which 5 types of
    different ions flow
     >> >> in it. how can i do that with gromacs?
     >> >> thanks
     >> >>
     >> >>
     > > Assuming they are monoatomic, you can use genion after you have
    added
     > > water.  If they are polyatomic, use genbox -ci -nmol (before
    filling the box
     > > with water).
     > >
     > > -Justin
     > >
     > > --
     > > ========================================
     > >
     > > Justin A. Lemkul
     > > Ph.D. Candidate
     > > ICTAS Doctoral Scholar
     > > MILES-IGERT Trainee
     > > 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
MILES-IGERT Trainee
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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