Hi i wrote the code below but when i run it i face two errors that i dont get it can anyone help me
Error using iddata/numArgumentsFromSubscript (line 8) The syntax "Data{…}" is not supported. Use the "getexp" command to extract individual experiments from an IDDATA object.
Error in arma (line 29)
plot(t,yhat1{1}.y,'–',t,y);
I have this two erros please help me
Thanks
%% Generate the data
N = 250; Ts = 1; u_var = 1; noise_var = 1;a = [1 -1.5 0.7]; b = [0 1 .5]; c = [1 -1 0.2];u = sign(randn(2*N,1))*sqrt(u_var); v = randn(2*N,1);M = idpoly(a,b,c,1,1,noise_var,Ts);y = sim(M,[u v]);uv = u(N+1:end); vv = v(N+1:end); yv = y(N+1:end);u = u(1:N); v = v(1:N); y = y(1:N);DATe = iddata(y,u,Ts); DATv = iddata(yv,uv,Ts);DATe1 = get(DATe); DATv1= get(DATv)%% Identification
na = 2; nb = 2; nc = 2;theta_pem = armax(DATe,[na nb nc 1]); % ARMAX using PEM
%% Compare the measured output and the model output
[yhat1,fit1] = compare(DATe,theta_pem);[yhat2,fit2] = compare(DATv,theta_pem);t = 1:N;figure;subplot(2,1,1);plot(t,yhat1{1}.y,'--',t,y);legend('model','measured');title('Comparison on estimation data set','FontSize',16);ylabel('y');xlabel('t');subplot(2,1,2);plot(t,yhat2{1}.y,'--',t,yv);legend('y2','y');legend('model','measured');title('Comparison on validation data set','FontSize',16);ylabel('y');xlabel('t');
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