
          = 'I':  Z is initialized to the unit matrix and the
                  orthogonal transformation matrix Z is returned;
          = 'U':  The given matrix Z is updated by the orthogonal
                  transformations used in the reduction.

</PRE>
<B>Input/Output Parameters</B>
<PRE>
  M       (input) INTEGER
          The number of rows in the matrices A, E and the order of
          the matrix Q.  M &gt;= 0.

  N       (input) INTEGER
          The number of columns in the matrices A, E and th