The natural log in MATLAB is simply log(x) . You're mixing the two: log in MATLAB · log in MuPAD. The error message you get is because the ... ... <看更多>

I would like to add that if you need to work on a vector value of x and y you will have to put a "dot" before the ^2. x.*(log(1000/y)).^2. ... <看更多>