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    Hi Yeping <br>
    <br>
    El 13/12/11 13:17, yp sun escribi&oacute;:
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              <div>Dear Sir,</div>
              <div>&nbsp;</div>
              <div>I finished my simulation with gromacs, but whatever
                orders I use to analysize the results, I always get
                errors. For example, when I type: </div>
              <div>g_density -f&nbsp; md.trr</div>
              <div>It returns: </div>
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                Program g_density, VERSION 3.3.1<br>
                Source code file: gmxfio.c, line: 706</div>
              <div>Can not open file:<br>
                topol.tpr<br>
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    You need a *.trp file: named topol.tpr by default, but you can set
    your particular one with -s label. What the error say is that the
    file "topol.tpr" either does not exists or has not the right
    permissions. <br>
    <br>
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              <div>When I type: <br>
                &nbsp;g_energy &#8211;f md.edr &#8211;o potential.xvg</div>
              <div>It returns: </div>
              <div>Program g_energy, VERSION 3.3.1<br>
                Source code file: statutil.c, line: 799</div>
              <div>Invalid command line argument:<br>
                &#8211;f<br>
              </div>
              <div>When I type: g_rms &#8211;s md.tpr &#8211;f md.trr &#8211;o rmsd.xvg</div>
              <div>&nbsp;</div>
              <div>It returns: </div>
              <div>Program g_rms, VERSION 3.3.1<br>
                Source code file: statutil.c, line: 799</div>
              <div>Invalid command line argument:<br>
                &#8211;s<br>
                &nbsp;</div>
              <div>When I type: </div>
              <div>g_gyrate &#8211;f md.trr &#8211;s md.tpr &#8211;o gyrate.xvg</div>
              <div>It retures: </div>
              <div>Program g_gyrate, VERSION 3.3.1<br>
                Source code file: statutil.c, line: 799</div>
              <div>Invalid command line argument:<br>
                &#8211;f<br>
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    These three cases seem as a problem with the character "-", you
    using a differently encoded character (in your first example it is
    right however)<br>
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              <div>I totally have no ideas about these error. I didn't
                get error information when I do the simulation. I should
                I do with this situation?</div>
              <div>&nbsp;</div>
              <div>Thanks!</div>
              <div>Yeping Sun<br>
                CAS Key Laboratory of Pathogenic Microbiology &amp;
                Immunology<br>
                INSTITUTE OF MICROBIOLOGY CHINESE ACADEMY OF SCIENCES <br>
                NO.1 Beichen West Road,Chaoyang District,Beijing
                100101,china<br>
                <br>
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    <pre class="moz-signature" cols="72">-- 
Javier CEREZO BASTIDA
PhD Student
Physical Chemistry
Universidad de Murcia
Murcia (Spain)
Tlf.(+34)868887434</pre>
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