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schord
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1994-02-21
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634b
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24 lines
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