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t=[0:0.01:5];u=t; C=[25],R=[1,4,25]; G=tf(C,R);
[y1,T]=step(G,t); y2=lsim(G,u,t);
subplot(121),plot(T,y1,'--'); xlabel('t(sec)'),ylabel('x(t)'); grid on;
subplot(122),plot(t,y2,'-.'); grid on;
xlabel('t(sec)'),ylabel('x(t)');
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t=[0:0.001:1]; yss=1;dta=0.02; C=[25],R=[1,4,25]; G=tf(C,R); y=step(G,t);
r=1;while y(r) [ymax,tp]=max(y);tp1=(tp-1)*0.001; mp=(ymax-yss)/yss; s=1001;while y(s)>1-dta && y(s)<1+dta;s=s-1;end ts=(s-1)*0.001; [tr tp1 mp ts] ·ÂÕæ½á¹û¼°·ÖÎö£º C = 25 ans = 0.4330 0.6860 0.2538 1.0000 ÓÉÊä³ö½á¹ûÖª£ºÉÏÉýʱ¼äΪ0.4330Ã룬·åֵʱ¼äΪ0.6860Ã룬×î´ó³¬µ÷Á¿Îª0.2538£¬µ÷Õûʱ¼ä1.0000Ãë¡£ 4 ÌâÄ¿3 Ô´´úÂ룺 syms s; t=[0:0.001:2]; b=0.1;num1=20*b;den1=[1 10 num1];G1=tf(num1,den1); b=1;num2=20*b;den2=[1 10 num2];G2=tf(num2,den2); b=10;num3=20*b;den3=[1 10 num3];G3=tf(num3,den3); b=100;num4=20*b;den4=[1 10 num4];G4=tf(num4,den4); µÚ 3 Ò³