包含了控制理论的各种仿真程序

				% Fig. 6.39   Feedback Control of Dynamic Systems, 4e 
				%             Franklin, Powell, Emami
				%
				
				clear all;
				close all;
				
				num=[1 1 1];
				den=[1 10 24 0 0 0];
				rlocus(num,den);
				grid;
				title('Fig. 6.39 Root Locus of a conditionally stable system');