  );

           <a href="mxv_c.html">mxv_c</a> ( jacobi, state+3, pgrvel );


           /.
           As a check, convert the planetographic state back to
           rectangular coordinates.
           ./
           <a href="pgrrec_c.html">pgrrec_c</a> ( &quot;mars&quot;, lon, lat, alt, re, f, rectan );
           <b>drdpgr_c</b> ( &quot;mars&quot;, lon, lat, alt, re, f, jacobi );

           <a href="mxv_c.html">mxv_c</a> ( jacobi, pgrvel, drectn );

           printf ( &quot;\n&quot;
                   