                to be zero.
</PRE>
<h4><a name="Parameters">Parameters</a></h4>
<PRE>
   None.
</PRE>
<h4><a name="Exceptions">Exceptions</a></h4>
<PRE>
   Error free.

   If both v1 and v2 are zero vectors then <b>vrel_c</b> is defined
   to be zero.
</PRE>
<h4><a name="Files">Files</a></h4>
<PRE>
   None.
</PRE>
<h4><a name="Particulars">Particulars</a></h4>
<PRE>
   This function computes the relative difference between two
   3-dimensional vectors as defined above.

   The function <a href="vrelg_c.html