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Sorry for insisting, but I still don't get it:<br>
<br>
If I only take a single frame, e.g.:<br>
<br>
@ s0 legend "Rg"<br>
@ s1 legend "RgX"<br>
@ s2 legend "RgY"<br>
@ s3 legend "RgZ"<br>
1 1.76618 1.21448 1.50536 1.58042<br>
<br>
I get Rg= sqrt ((Rx^2 + Ry^2 + Rz^2) * 0.5)<br>
<br>
Thanks,<br>
Ran.<br>
<br>
David van der Spoel wrote:<br>
<blockquote type="cite" cite="mid1121849469.5120.4.camel@vangogh">
<pre wrap="">On Wed, 2005-07-20 at 10:58 -0400, Ran Friedman wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hello,
I'm trying to understand the relation between the total radius of
gyration and its components. Searching to the mailing list, I found
that Rg = sqrt (Rx^2 + Ry^2 + Rz^2), see
<a class="moz-txt-link-freetext" href="http://www.gromacs.org/pipermail/gmx-users/2003-October/007376.html">http://www.gromacs.org/pipermail/gmx-users/2003-October/007376.html</a>
But what I got was:
set average stddev
SS1 1.744821e+00 2.028432e-02 (Rg)
SS2 1.195420e+00 1.366429e-02 (Rx)
SS3 1.485673e+00 2.606876e-02 (Ry)
SS4 1.565914e+00 2.048274e-02 (Rz)
which means:
Rg = sqrt ((Rx^2 + Ry^2 + Rz^2) * 0.5)
What's wrong?
</pre>
</blockquote>
<pre wrap=""><!---->You should do the averaging after summing up the components.
</pre>
<blockquote type="cite">
<pre wrap="">Thanks,
Ran.
</pre>
</blockquote>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
------------------------------------------------------
Ran Friedman
Laser Laboratory for Fast Reactions in Biology
Department of Biochemistry
Faculty of Life Sciences
Tel-Aviv University
Tel. +972-3-6409824
Fax. +972-3-6409875
------------------------------------------------------
</pre>
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