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schur
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1994-02-21
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536b
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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