chap4_7b.m chap3_1.m chap3_2.m chap3_3.M chap3_4.m chap3_5.m chap4_1.m chap2_1.m chap4_2.m chap4_3.mdl chap4_4.m chap4_5.m chap4_6.m chap4_7a.m