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RedHat 9 (Linux i386) - man page for ztrexc (redhat section l)

ZTREXC(l)					)					ZTREXC(l)

NAME
       ZTREXC  -  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 ZTREXC( COMPQ, N, T, LDT, Q, LDQ, IFST, ILST, INFO )

	   CHARACTER	  COMPQ

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

	   COMPLEX*16	  Q( LDQ, * ), T( LDT, * )

PURPOSE
       ZTREXC 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 similarity transformation Z**H*T*Z, and optionally the matrix Q  of
       Schur vectors 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*16 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*16 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 				ZTREXC(l)


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