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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,C,[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.

EXAMPLE
  A=diag([1,2,3]);C=[1,0,0];
  unobs(A,C)

SEE ALSO
  contr, contrss, canon, cont_mat, spantwo, dt_ility