Incorrect dimensions for matrix multiplication

Question

Gautami Golani 2019-3-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/448845-incorrect-dimensions-for-matrix-multiplication

评论： Adarsh Ghimire 2019-3-9

data.mat

%Load the data
load data.mat;
%Extracting first 500 points
z = [y(1:500) u(1:500)];
%Plotting the data
figure(1)
idplot(z);
%Using sampling interval of 80ms
figure(1)
idplot(z, 1:500, 0.08);
%Reserving the remaining data
zr = [y(501:1000) u(501:1000)];
%Removing constant levels and making data zero mean
z = dtrend(z);
zr = dtrend(zr);
%Loss function calaculation
V = arxstruc(z, zr, struc(2,2, 1:10));
value = V(1,:);
nk_value = min(value);
V = arxstruc(z, zr, struc(1:5, 1:5, 3));
%Searching for settled-in point
nns = selstruc(V);
i=1;
%Model structure
for na = 1:5
    for nb = 1:5
        val(i,:) = na+nb;
        th = arx(z,[na, nb, 3]);
        mse(i,:) = [th.Report.Fit.MSE];
        a = th.a;
        b = th.b;
        ysim = idsim(zr(:, 2), th);
        i=i+1;
        matx = [val mse];        
             
        A = matx;                                                      
        [A1u,~,idx] = unique(A(:,1));                                   
        MinVals = accumarray(idx, A(:,2), [], @(x)min(x));             
        Result = [A1u, MinVals];                                       
        
        m_one = Result(:,1);
        m_two = Result(:,2);
        
        figure(2)
        plot(m_one, m_two)
        title('Complexity vs Loss Function');
        xlabel('Complexity');
        ylabel('Loss Function');
       
    end
end
%A-parameter and B-parameter
th = arx(z,[4 4 3]);
th = sett(th, 0.08);
present(th);
A=th.a
B=th.b
%Least Square Estimation
i = 1;
for k=6:length(z)
    phi(i,1:5) = [-z(k-1,1) -z(k-2,1) z(k-3,2) z(k-4,2) z(k-5,2)];
    i = i+1;
end
Y = z(6:end,1);
L = inv(phi'*phi)*phi*Y;

Getting an error that says 'Incorrect dimensions for matrix multiplication.'

Can anyone explain why this error comes up?

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Walter Roberson 2019-3-7

This code requires idplot(), which existing in the MATLAB 3 (1987) to MATLAB 5 (1997) timeframe and which was removed from MATLAB before R13. A copy of the source appears to be at http://research.jisao.washington.edu/vimont_matlab/System/idplot.html

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