Why do I get the error?

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Aishwarya Bangalore Kumar
评论： Aishwarya Bangalore Kumar 2018-2-23
This is my code
t=0:.1:5;
u(1:25)=.1;
u(26:51)=-.1;
plot(t,u);
[to,yo]=sim('hw3',5,[],[t',u']);
%Finding u_final and cost
l_b=ones(51,1)*(-50);
u_b=ones(51,1)*50;
options=optimset('Display','iter','PlotFcns','optimplotx');
[u_final,cost]=fmincon('find_cost',u,[],[],[],[],l_b,u_b,'find_constraint',options);
[t_f,x_f,y_f]=sim('hw3',5,[],[t' u_final']);
figure(3);
subplot(t_f,y_f(:,1));
grid;
xlabel('Time');
ylabel('Position');
figure(4);
subplot(t_f,y_f(:,2));
grid;
xlabel('Time');
ylabel('Velocity');
figure(5);
subplot(t_f,y_f(:,3));
grid;
xlabel('Time');
ylabel('Acceleration');
figure(6);
subplot(t_f,y_f(:,4));
grid;
xlabel('Time');
ylabel('Jerk');
figure(7);
subplot(t_f,y_f(:,5));
grid;
xlabel('Time');
ylabel('Jounce');
Every time i run the code it says Vectors must be of same length.
u and t should be of same size. Please help
  6 个评论
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Aishwarya Bangalore Kumar
Aishwarya Bangalore Kumar 2018-2-23
I am still getting the same error
Aishwarya Bangalore Kumar
Aishwarya Bangalore Kumar 2018-2-23
I understood sir thank you

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回答（1 个）

KSSV
KSSV 2018-2-23
Use this:
t=0:.1:5;
u = zeros(size(t)) ;
u(1:round(length(t)/2))=.1;
u(round(length(t)/2)+1:end)=-.1;
plot(t,u);

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