matlab codes\exp1.m ............\expr10_Filter.m ............\expr11_sampling.m ............\expr12_DCT.m ............\expr1b_stem_fn.m ............\expr1_exp_fn.m ............\expr2_surf_mesh.m ............\expr3_continuos_sig.m ............\expr4_unit_step.m ............\expr5_energy_power.m ............\expr6_linear.m ............\expr7_conv.m ............\expr8_DTFT.m ............\expr9_IIR_response.m matlab codes