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CTREXC(l)			       )			     CTREXC(l)

NAME
       CTREXC  -  reorder  the	Schur  factorization  of  a complex matrix A =
       Q*T*Q**H, so that the diagonal element of T  with  row  index  IFST  is
       moved to row ILST

SYNOPSIS
       SUBROUTINE CTREXC( COMPQ, N, T, LDT, Q, LDQ, IFST, ILST, INFO )

	   CHARACTER	  COMPQ

	   INTEGER	  IFST, ILST, INFO, LDQ, LDT, N

	   COMPLEX	  Q( LDQ, * ), T( LDT, * )

PURPOSE
       CTREXC  reorders	 the  Schur  factorization  of	a  complex  matrix A =
       Q*T*Q**H, so that the diagonal element of T  with  row  index  IFST  is
       moved to row ILST.  The Schur form T is reordered by a unitary similar‐
       ity transformation Z**H*T*Z, and optionally the matrix Q of Schur  vec‐
       tors is updated by postmultplying it with Z.

ARGUMENTS
       COMPQ   (input) CHARACTER*1
	       = 'V':  update the matrix Q of Schur vectors;
	       = 'N':  do not update Q.

       N       (input) INTEGER
	       The order of the matrix T. N >= 0.

       T       (input/output) COMPLEX array, dimension (LDT,N)
	       On  entry,  the	upper  triangular  matrix  T.	On  exit,  the
	       reordered upper triangular matrix.

       LDT     (input) INTEGER
	       The leading dimension of the array T. LDT >= max(1,N).

       Q       (input/output) COMPLEX array, dimension (LDQ,N)
	       On entry, if COMPQ = 'V', the matrix Q of  Schur	 vectors.   On
	       exit,  if COMPQ = 'V', Q has been postmultiplied by the unitary
	       transformation matrix Z which reorders T.  If COMPQ = 'N', Q is
	       not referenced.

       LDQ     (input) INTEGER
	       The leading dimension of the array Q.  LDQ >= max(1,N).

       IFST    (input) INTEGER
	       ILST	(input) INTEGER Specify the reordering of the diagonal
	       elements of T: The element with row index IFST is moved to  row
	       ILST by a sequence of transpositions between adjacent elements.
	       1 <= IFST <= N; 1 <= ILST <= N.

       INFO    (output) INTEGER
	       = 0:  successful exit
	       < 0:  if INFO = -i, the i-th argument had an illegal value

LAPACK version 3.0		 15 June 2000			     CTREXC(l)
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