ding dimension of array A.  LDA &gt;= N.

  U       (input/output) DOUBLE PRECISION array, dimension (LDU,N)
          On entry, the leading N-by-N part of this array must
          contain a transformation matrix U.
          On exit, the leading N-by-N part of this array contains
          U*UT, where UT is the transformation matrix used to
          split and/or standardize the selected block.

  LDU     INTEGER
          The leading dimension of array U.  LDU &gt;= N.

  E1, E2  (output) DOUBLE PRECISIO