Fmincon usage for fixed costs

I am using Matlab R2012a and I am trying to incorporate fixed costs in establishing links in a supply chain. My objective function is very similar to the one discussed in this thread http://www.mathworks.in/matlabcentral/newsreader/view_thread/314409 I shall attach my testing objective function to this mail. If you have some insight into this matter, please help me out.

Thank You

function y = simple_objective(x,C,c,nodes)
    y=0;
    k=1;
    for i = 1:nodes,
        for j = 1:nodes,
            if c(i,j) > -1
                if(c(i,j)> 0)
                    y = y+ x(k)*C(i,j) + x(k)*x(k);
                end
                k = k+1;
            end
        end
    end
    % New links in full merger : 3   4   5   6   12  14  15  17
    % fixed costs on these     : 50  25  40  30  25  10  30  20
    fc = zeros(1,18);
    fc(3)=50;
    fc(4)=25;
    fc(5)=40;
    fc(6)=30;
    fc(12)=25;
    fc(14)=10;
    fc(15)=30;
    fc(17)=20;
    fc2 = zeros(1,18);
    for i = 1:18,
        if x(i)> 0.0001
            if fc2(i)==0
                y = y+fc(i)*5;
                fc2(i)=1;
            end
        end           
    end
end

The last part is what i want clarified.... The fixed cost must come into picture only if there is a flow on the respective new link If Fmincon can't help, is there any other alternative ?