</B></A>

<P>
<B><FONT SIZE="+1">Purpose</FONT></B>
<PRE>
  To compute the eigenvalues of a selected 2-by-2 diagonal block
  of an upper quasi-triangular matrix, to reduce the selected block
  to the standard form and to split the block in the case of real
  eigenvalues by constructing an orthogonal transformation UT.
  This transformation is applied to A (by similarity) and to
  another matrix U from the right.

</PRE>
<A name="Specification"><B><FONT SIZE="+1">Specification</FONT></B></A>
<PRE>
      SUBR