Index in position 2 is invalid. Array indices must be positive integers or logical values.

Hi. Im a newb. Im struggling to figure this part out. From what I can see, none of my indexes are negative. How can I fix this?

for iter=J:-1:1  % loop over 
    iter;
    for indY=1:dimY
        V(:, indY)=interp1(K, V(:, indY), K_prime, 'linear', 'extrap');
    end
    for ik=1:dimK     % loop over all current cake sizes
        for ik2=1:dimK
            c=K(ik)*(1+r)+Y(iter)-K(ik2);
            if c>0 
                U(ik, Y(iter), K(ik))=((c)^(1-eta)-1)/(1-eta)+beta*transY(indY, :).*(V(ik2, :)');
            else
                U(ik2)=-1e10;
            end
        end
        [V(ik, iter), ind]=max(U);     % optimizing over size of next period cake
        A(ik, iter)=K(ind);
        A_ind(ik, iter)=ind;
        C(ik, iter)=K(ik)*(1+r)+Y(iter)-K(ind);
    end
end

Im assuming the line I have bolded is the issue, but Im not entirely sure.

Thank you for your help!

Answer 1

[Star Strider]

My guess is that the problem is using ‘Y(iter)’ and ‘K(ik)’ as indices in that assignment. They may not be integers greater than 0, or logical values. All the other array references appear to be correct

Answer 2

[Image Analyst]

A thorough explanation of the error is given in the FAQ: https://matlab.fandom.com/wiki/FAQ#.22Subscript_indices_must_either_be_real_positive_integers_or_logicals..22