Sir, <br><br>Thats right. But what I felt was, all these<br>problems are connected. (I dont mean that <br>temperature is connected to box dimension) <br>Actually I was getting nan under RMSD for all<br>the energy terms. <br>
<br>I have checked the total energy graph also it <br>is stable. <br>even in case of box dimentions I checked the <br>box dimensions for the whole trajectory for eg.<br>Box-X most of the time has value around 9. very<br>few times it gets a value near 8.9..<br>
<br>Thank you<br>With Regards<br>M. Kavyashree<br><br><div class="gmail_quote">On Fri, Jun 24, 2011 at 6:18 PM, Justin A. Lemkul <span dir="ltr">&lt;<a href="mailto:jalemkul@vt.edu">jalemkul@vt.edu</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><br>
<br>
Kavyashree M wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Sir,<br>
<br><div class="im">
I tried it already but It was huge file. this kind of nan comes only<br>
for RMSD not for any other term. I will try looking into that file again.<br>
<br>
</div></blockquote>
<br>
Let&#39;s keep on topic and focus on the box vectors; changing the subject midway makes it harder to arrive at a solution.  The only diagnostic I can suggest is gmxdump.  It should be rather obvious what&#39;s going on - your reported averages are 0.04, but the actual values from the plot are clearly different.<br>

<br>
-Justin<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
Thanks<br>
With regards<br>
M. Kavyashree<br>
<br>
<br>
<br></div><div><div></div><div class="h5">
On Fri, Jun 24, 2011 at 5:20 PM, Justin A. Lemkul &lt;<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a> &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a>&gt;&gt; wrote:<br>

<br>
<br>
<br>
    Kavyashree M wrote:<br>
<br>
        Sir,<br>
<br>
        I am sorry I did not get any mail for that query since I posted it.<br>
        So I had to ask once again..<br>
<br>
        1. g_energy -f ener.edr -o  box.xvg<br>
           selecting 15 16 17 0<br>
<br>
        2. gmxcheck -e ener.edr<br>
<br>
          Opened ener.edr as single precision energy file<br>
          frame:      0 (index      0), t:      0.000          Last<br>
        energy frame read 50000 time 100000.000                  Found 50001 frames with a timestep of 2 ps.<br>
<br>
        3. Gromacs version 4.5.3<br>
<br>
        This is the same data where I was mentioning that I<br>
        was getting &quot;not a number&quot;  (nan) error for all<br>
        energy calculations under RMSD section.<br>
<br>
<br>
    I&#39;ve said several times before that this energy file is probably<br>
    junk, and again I&#39;d suspect that.  The only thing to check would be<br>
    to run gmxdump on the .edr file (and redirect into some output file<br>
    or pipe the output through &quot;more&quot; to actually see it) and see where<br>
    the energy values go screwy.  If you find a bunch of nonsensical<br>
    information, then you have your answer.<br>
<br>
    -Justin<br>
<br>
        Thank you fro answering.<br>
<br>
        With Regards<br>
        M. Kavyashree<br>
<br>
<br>
        On Fri, Jun 24, 2011 at 4:57 PM, Justin A. Lemkul<br>
        &lt;<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a> &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a>&gt;<br></div></div><div><div></div><div class="h5">
        &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a> &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a>&gt;&gt;&gt; wrote:<br>
<br>
<br>
<br>
           Kavyashree M wrote:<br>
<br>
               Dear users,<br>
<br>
               Any suggestions?<br>
<br>
<br>
           You haven&#39;t provided nearly enough diagnostic information for<br>
        anyone<br>
           to offer you any useful help (as Mark said yesterday).  For<br>
        example,<br>
           please provide:<br>
<br>
           1. Your exact g_energy command line<br>
           2. The output of gmxcheck for this .edr file<br>
           3. Your Gromacs version<br>
<br>
           -Justin<br>
<br>
               Thank you<br>
               M. Kavyashree<br>
<br>
<br>
               On Thu, Jun 23, 2011 at 10:38 AM, Kavyashree M<br>
               &lt;<a href="mailto:hmkvsri@gmail.com" target="_blank">hmkvsri@gmail.com</a> &lt;mailto:<a href="mailto:hmkvsri@gmail.com" target="_blank">hmkvsri@gmail.com</a>&gt;<br>
        &lt;mailto:<a href="mailto:hmkvsri@gmail.com" target="_blank">hmkvsri@gmail.com</a> &lt;mailto:<a href="mailto:hmkvsri@gmail.com" target="_blank">hmkvsri@gmail.com</a>&gt;&gt;<br>
               &lt;mailto:<a href="mailto:hmkvsri@gmail.com" target="_blank">hmkvsri@gmail.com</a> &lt;mailto:<a href="mailto:hmkvsri@gmail.com" target="_blank">hmkvsri@gmail.com</a>&gt;<br>
        &lt;mailto:<a href="mailto:hmkvsri@gmail.com" target="_blank">hmkvsri@gmail.com</a> &lt;mailto:<a href="mailto:hmkvsri@gmail.com" target="_blank">hmkvsri@gmail.com</a>&gt;&gt;&gt;&gt; wrote:<br>
<br>
                  Dear users,<br>
<br>
                   In one of the simulations while calculating box<br>
        dimensions<br>
                  using g_energy this output was obtained -<br>
                  Statistics over 50000001 steps [ 0.0000 through<br>
        100000.0000<br>
               ps ], 3<br>
                  data sets<br>
                  All statistics are over 1978700 points<br>
<br>
                  Energy                      Average   Err.Est.       RMSD<br>
                Tot-Drift<br>
                                ------------------------------<u></u>____--------------------------<u></u>--__--__-------------------<br>
                  Box-X                     0.0453229        1.8          0.637535             -9.93022  (nm)<br>
                  Box-Y                     0.0453229        1.8          0.637535             -9.93022  (nm)<br>
                  Box-Z                     0.0320482        1.3          0.450805             -7.02173  (nm)<br>
<br>
                  but the dimensions of the box is different. plot attached.<br>
                  I am not able to figure out why only 1978700 data<br>
        point are<br>
               considered.<br>
                  Kindly give some suggestions.<br>
<br>
                  Thank you<br>
                  with regards<br>
                  M.Kavyashree<br>
<br>
<br>
<br>
           --     ==============================<u></u>____==========<br>
<br>
           Justin A. Lemkul<br>
           Ph.D. Candidate<br>
           ICTAS Doctoral Scholar<br>
           MILES-IGERT Trainee<br>
           Department of Biochemistry<br>
           Virginia Tech<br>
           Blacksburg, VA<br></div></div>
           jalemkul[at]<a href="http://vt.edu" target="_blank">vt.edu</a> &lt;<a href="http://vt.edu" target="_blank">http://vt.edu</a>&gt; &lt;<a href="http://vt.edu" target="_blank">http://vt.edu</a>&gt; | (540)<div class="im">
<br>
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<br>
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    Justin A. Lemkul<br>
    Ph.D. Candidate<br>
    ICTAS Doctoral Scholar<br>
    MILES-IGERT Trainee<br>
    Department of Biochemistry<br>
    Virginia Tech<br>
    Blacksburg, VA<br>
    jalemkul[at]<a href="http://vt.edu" target="_blank">vt.edu</a> &lt;<a href="http://vt.edu" target="_blank">http://vt.edu</a>&gt; | (540) 231-9080<br>
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</div></div></blockquote><div><div></div><div class="h5">
<br>
-- <br>
==============================<u></u>==========<br>
<br>
Justin A. Lemkul<br>
Ph.D. Candidate<br>
ICTAS Doctoral Scholar<br>
MILES-IGERT Trainee<br>
Department of Biochemistry<br>
Virginia Tech<br>
Blacksburg, VA<br>
jalemkul[at]<a href="http://vt.edu" target="_blank">vt.edu</a> | (540) 231-9080<br>
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