o construct the inverse of m: 
      
      #include &quot;SpiceUsr.h&quot;
           .
           .
           .
      <b>invort_c</b> ( m, invers );
         
   This method is numerically more robust than calling the 
   routine <a href="invert_c.html">invert_c</a>. 
 </PRE>
<h4><a name="Restrictions">Restrictions</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Literature_References">Literature_References</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Author_and_Institution">Author_and_Institution</a><