schord:

Syntax:	schord ( SCH_LIST, IFST, ILST )

Description:

	Schord re-orders the real-Schur/Schur factorization of a
	real/complex matrix:

                A = z * t * z'

	so that the diagonal block of t with row index IFST is moved
	to row ILST. The real-Schur/Schur form t is re-ordered by an
	orthogonal/unitary similarity transformation O'*t*O. The
	matrix z of Schur vectors is updated by postmultiplying it
	with O.

        The 1st argument to schord, SCH_LIST is the output list from
	schur(). SCH_LIST must contain elements `z' and `t'.	

        Schord uses the LAPACK subroutines DTREXC, and ZTREXC.

See Also: schur
