schur:

Syntax:	schur ( A )

Description:

	The schur function returns a list containing elements `t' and
	`z', such that:

		A = z * t * z'

	If A is real, the `t' is in "Real-Schur" form. The
	"Real-Schur" form is block upper-triangular with 1-by-1 and
	2-by-2 diagonal blocks; each 2-by-2 diagonal block has its
	diagonal elements equal and its off-diagonal elements of
	opposite sign. The eigenvalues of the 2-by-2 block: 
	[a, b; c, a] are: a +/- sqrt(b*c)

	schur() uses the LAPACK subroutines DGEES, and ZGEES.

See Also: schord
