Index exceeds the number of array elements. Index must not exceed 1.

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Chacha Ankush
Chacha Ankush 2021-10-20
回答： Richard Stephens 2021-10-20
close all;
>> clear all;
>> z=[0,0.1,0.2,0.4,0.6,0.7,0.8,0.9,1];
>> num=[0 0 75];
>> t=0:0.1:25;
>> u=ones(1,251);
>> r=t;
>> for i=1:1:9
den=[1 20*z(i) 75];
>> T=tf(num, den);
>> [y{i}]=lsim(T,r,t);
>> subplot(5,2,1);
>> plot (t,y{i},t,r);
>> title('time response of second order systemfor different values of zeta');
>> z=num2str(z(i));
>> end;
>> subplot(5,2,10);
>> plot(t,y{1},t,y{2},t,y{3},t,y{4},t,y{5},t,y{6},t,y{7},t,y{8},t,y{9});
>> axis([0 1 0 1]);
>> xlabel('time sec');
>> ylabel('amplitude');
>> title('time response for second second order systemfor different values of zeta');
>> legend ('z=0','z=0.1','z=0.2','z=0.4','z=0.6','z=0.7','z=0.8','z=0.9','z=1');

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回答（1 个）

Richard Stephens
Richard Stephens 2021-10-20
The line
z=num2str(z(i));
should be deleted: it overwrites z which becomes a single char.
It would be helpful if you submitted code without the ">>" by copying from the Command History window.

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