MATLAB: Array indices must be positive integers or logical values.

array indices;error

Hi! I am getting this error and I do not understand why.
This is the line that is producin the error. However, all variables in this line have been defined successfully, and none of them are arrays. I do have the final loop, but it uses positive integers. Any thoughts?
M_max = -R1(distg2-distr1)+G1(distg2-distg1);
M_min = 0;
M_m = (M_max + M_min)/2;    % Median moment
M_a = (M_max - M_min)/2;    % Alternating moment
s_m = M_m*(d/2)/I;          % Sigma m
s_a = M_a*(d/2)/J;          % Sigma a
sigma_m = zeros(3);
sigma_a = zeros(3);
for (i = 1:3)
    sigma_m(i) = kt(i)*s_m;           % von mises equivalent median stress
    sigma_a(i) = kt(i)*s_m;          % von mises equivalent alternating stress
end

Best Answer

You forgot to put in the multiplication operator. MATLAB has no implied multiplication, not anywhere. A(B) is indexing or function invocation, never multiplication.
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