            |     |
              | -1.  1.  0. |              | 10. |
              |             |              |     |
              |  0.  0.  1. |              | 15. |


   then the call

      <b>mtxv_c</b> ( m1, vin, vout )

   produces the vector


      vout = | -5. |
             |     |
             | 15. |
             |     |
             | 15. |
</PRE>
<h4><a name="Restrictions">Restrictions</a></h4>
<PRE>
   The user is responsible for checking the magnitudes of the
   elements of m1 and vin 