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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dear David, these are my conclusions so far:<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I believe that replacing XX and XX for YY and ZZ gives the
correct answer and fixes the <span class=SpellE>g_velacc</span> bug.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The for loop should be left as it was in the original <span
class=SpellE>g_velacc.c</span> code, [<span class=SpellE>i.e</span> <span
class=GramE>for(</span>j=0; j&lt;<span class=SpellE>atndx</span>[index[<span
class=SpellE>i</span>]+1] - <span class=SpellE>atndx</span>[index[<span
class=SpellE>i</span>]]; j++)]<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Having said this, I must admit again that I know nothing
about the data structure inside <span class=SpellE>gromacs</span> so somebody
who understands it should really test that what I&#8217;m saying is correct.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To come to these results I had to do a lot of <span
class=SpellE>trjconv</span> into <span class=SpellE>gro</span> files and then a
bunch of <span class=SpellE>perl</span>. It would be very helpful to me if I
knew exactly what goes into the <span class=SpellE>trr</span> files so that I could
try to find some <span class=SpellE>xdr</span> reader in <span class=SpellE>fortran</span>
(which I am more comfortable with than C) and I could pull out the data. <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Does anybody have a <span class=SpellE><span class=GramE>fortran</span></span>
program that reads <span class=SpellE>trr</span> files?<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If not, can anybody point out to the <span class=SpellE>xdr</span>
decoding routines in <span class=SpellE><span class=GramE>fortran</span></span>?
<span class=GramE>and</span> also to the exact data that is written into the <span
class=SpellE>trr</span> files?<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank you!<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Cheers,<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Claudio.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>On Tue, 2003-12-02 at </span></font><st1:time Hour="23"
Minute="0"><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
 Arial'>23:00</span></font></st1:time><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>, Claudio J. Margulis wrote:<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; Dear David, <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; I already did that, and my impression is that it is
still broken.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>try</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> replacing<o:p></o:p></span></font></p>

<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>for(</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>j=0; j&lt;<span
class=SpellE>atndx</span>[index[<span class=SpellE>i</span>]+1] - <span
class=SpellE>atndx</span>[index[<span class=SpellE>i</span>]]; j++) {<o:p></o:p></span></font></p>

<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>by</span></font></span><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>for(</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>j=0; j&lt;<span
class=SpellE>atndx</span>[index[i+1]] - <span class=SpellE>atndx</span>[index[<span
class=SpellE>i</span>]]; j++) {<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; I have a liquid that includes the ions PF6- <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; Obviously P is for all purposes at the center of mass
of the<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <span class=GramE>molecules</span>.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; If I compute the velocity autocorrelation function for
P I get a<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; function<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <span class=GramE>that</span> is totally different from
the one I get for PF6-<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; I know the correlation function for P is right because
I computed it<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <span class=GramE>separately</span>.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt;<span style='mso-spacerun:yes'>&nbsp; </span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt;<span style='mso-spacerun:yes'>&nbsp; </span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; Thanks for looking into this.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; Claudio.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt;<span style='mso-spacerun:yes'>&nbsp; </span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt;<span style='mso-spacerun:yes'>&nbsp; </span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; Hi, I&#8217;m trying to use <span
class=SpellE>g_velacc</span> to compute the velocity<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <span class=GramE>autocorrelation</span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>&gt; &gt;&gt; function for a set of
molecules.</span></font></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; When I compute <span class=SpellE>g_velacc</span>
for atoms it gives the correct answer (I<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; wrote<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; my own program to check)<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; When I compute it for molecules (with option
&#8211;mol and <span class=SpellE>and</span> index<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; file<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; with molecules not atoms)<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; I get strange results.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt;<span style='mso-spacerun:yes'>&nbsp; </span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; I looked at the source code (<span
class=SpellE>admitedly</span> I&#8217;m a much better <span class=SpellE><span
class=GramE>fortran</span></span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; programmer than c) but these few lines look
weird to me.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; Can anybody tell me <span class=GramE>if<span
style='mso-spacerun:yes'>&nbsp; </span>line</span> 7 to 9 they are right or
not?<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; &gt;&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; --please replace by YY and ZZ and test. Could you
report back <span class=GramE>whether</span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <span class=GramE>that</span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; --solves the problem? I'm afraid this program is not
very often used,<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <span class=GramE>and</span><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt; --hence not well tested.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&gt;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'>-----------------------------------------------------------------------------------------</span></font><span
style='mso-no-proof:yes'><o:p></o:p></span></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'>Claudio J. Margulis</span></font><span
style='mso-no-proof:yes'><o:p></o:p></span></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'>Assistant Professor</span></font><span
style='mso-no-proof:yes'><o:p></o:p></span></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'>Department of Chemistry</span></font><span
style='mso-no-proof:yes'><o:p></o:p></span></p>

<p class=MsoNormal><st1:place><st1:PlaceType><font size=2 face=Arial><span
  style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>University</span></font></st1:PlaceType><font
 size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-no-proof:
 yes'> of </span></font><st1:PlaceName><font size=2 face=Arial><span
  style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>Iowa</span></font></st1:PlaceName></st1:place><span
style='mso-no-proof:yes'><o:p></o:p></span></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'>319 CB</span></font><span style='mso-no-proof:
yes'><o:p></o:p></span></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'>319-335-0615 (office)</span></font><span
style='mso-no-proof:yes'><o:p></o:p></span></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'><a
href="http://www.uiowa.edu/~chemdept/faculty/margulis/index.html">http://www.uiowa.edu/~chemdept/faculty/margulis/index.html</a></span></font><span
style='mso-no-proof:yes'><o:p></o:p></span></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'>-----------------------------------------------------------------------------------------</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

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