function z=poles(r)%POLES Poles of a Rational Polynomial Object. (MM)% D.C. Hanselman, University of Maine, Orono ME 04469% 3/27/98% Mastering MATLAB 6, Prentice Hall, ISBN 0-13-019468-9if ~isa(r,'mmrp')	error('POLES Defined for MMRP Objects Only.')endz=roots(r.d);