Index exceeds matrix dimensions,

When I run ukf_main, there is error messge:

Index exceeds matrix dimension. I really dont know where is my fault. Thank for all of your response.

Answer 1

[Walter Roberson]

xPred = sum(wSigmaPts_xmat .* (xPredSigmaPts(:,2:nsp) - repmat(xPredSigmaPts(:,1),1,nsp-1)),2);

xPredSigmaPts is a 6 x 1 double at the time of the error. You cannot take column 2 to nsp of a matrix that only has one column.

xPredSigmaPts = feval(ffun,xSigmaPts(1:states,:),repmat(U(:),1,nsp),xSigmaPts(states+1:states+vNoise,:),dt);

And ffun is ffun1, and ffun1 is

xout = [ 0.01919*x(6)^2 - 0.00051691*x(4)^2 + 0.96268*x(2)*x(4) - 0.013784*x(1)^2;
    0.0012494*x(4)*x(2)^2 - 0.007995*x(6) - 0.031872*x(4) - 1.0196*x(4)*x(1) - 0.001264*x(4)*x(2) - 0.0046864*x(3) + 1.5585e-6*x(4)^3 - 0.0035837;
    5.7303*x(6) - 2.9402*x(3) - 3.0606*x(4) + 1.961*x(4)*x(1) + 0.77732*x(4)*x(2) + 1.2159*x(4)*x(2)^2 + 0.00043617*x(4)^3 - 51.392;
    0.0051138*x(3) + 0.025393*x(6) + 0.053875*x(4) + 0.0039023*x(4)*x(1) + 0.0023632*x(4)*x(2) - 0.0030146*x(4)*x(2)^2 - 1.9436e-6*x(4)^3 + 0.000013716;
    x(4)*cos(x(6));
    x(3)];

That uses the first 6 elements of x no matter how large it is, and returns a 6 x 1 vector. At the time of the error, what is being passed in is 6 x 17.

Perhaps you should be calling ffun1 once for each column ?

[Baity Jannaty]

Thank you very much.