chap8\chap8_1.m .....\chap8_1eq.m .....\chap8_2plant.m .....\chap8_2plot.m .....\chap8_2s.m .....\chap8_2sim.mdl .....\chap8_3.m .....\chap8_4.m .....\chap8_5.m .....\chap8_6.m chap8