You had made some errors:
- symsum is a symbolic command for symbolic variables.
symsum(x(k),k,0,9) -> sum(x)
- in matlab, don't exist the zero index, the first index is one.
- you had miss one parenthesis some where.
- the argument y, only have 2 elements.
y(3) -> y(1)
- i think that you're confusing matlab script with another symbolic language like mathematica, cause you don't need symbolic toolbox.
function F = myobjfun(x,y)
n = numel(x);
i = 1;
F = y(1).*x(i).*log(1+x(i))/sum(x) - y(2).*x(i);
for i=2:n,
F = F + y(1).*x(i).*log(1+x(i))/sum(x) - y(2).*x(i);
end
