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unobs.4
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1999-09-16
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UNOBS(G) Scilab Function UNOBS(G)
NAME
unobs - unobservable subspace
CALLING SEQUENCE
[n,[U]]=unobs(A,C,[tol])
PARAMETERS
A, C : real matrices
tol : tolerance used when evaluating ranks (QR factorizations).
n : dimension of unobservable subspace.
U : orthogonal change of basis which puts (A,B) in canonical form.
DESCRIPTION
[n,[U]]=unobs(A,B,[tol]) gives the unobservable form of an (A,C) pair. The
n first columns of U make a basis for the controllable subspace.
The (2,1) block (made of last nx-n rows and n first columns) of U'*A*U is
zero and and the n first columns of C*U are zero.
SEE ALSO
contr, contrss, canon, cont_mat, spantwo, dt_ility