The system is created with SS model Transfer function parameters obtained by printtf() member function. Transfer function parameters: Numerator: 4.000000*s*s*s+8.400000*s*s+30.780000*s+60.000000 Denominator: 1.000000*s*s*s*s+4.120000*s*s*s+17.400000*s*s+30.800000*s+60.000000 Transfer function parameters obtained by tfdata() member function. num = 0.000000 4.000000 8.400000 30.780000 60.000000 den = 1.000000 4.120000 17.400000 30.800000 60.000000 ZPK information obtained by printzpk() member function. Zero-Pole-Gain parameters: Zero: complex(-0.049557,2.737558) complex(-0.049557,-2.737558) complex(-2.000885,0.000000) Pole: complex(-1.797086,2.213723) complex(-1.797086,-2.213723) complex(-0.262914,2.703862) complex(-0.262914,-2.703862) Gain: 4.000000 ZPK information obtained by zpkdata() member function. z = complex(-0.049557,2.737558) complex(-0.049557,-2.737558) complex(-2.000885,0.000000) p = complex(-1.797086,2.213723) complex(-1.797086,-2.213723) complex(-0.262914,2.703862) complex(-0.262914,-2.703862) k = 4.000000