UCP(C) tests if the polynomial C is a Unit-Circle-Polynomial. It tests if all roots lie inside the unit circle like B=ucp(C) does the same as B=all(abs(roots(C))<1) but much faster. The Algorithm is based on the Jury-Scheme. C are the elements of the Polynomial C(1)*X^N + ... + C(N)*X + C(N+1). REFERENCES: O. Foellinger "Lineare Abtastsysteme", Oldenburg Verlag, Muenchen, 1986. F. Gausch "Systemtechnik", Textbook, University of Technology Graz, 1993.