function out=testfunction2(X)
% Implements the fitness function for the knapsack problem.
%  INPUT:  Population (number of the population x 12)

%These are the values and weights from the problem (in the order given in
%the table)
val=[12 5 10 11 50 15 6 4 5 25 20 30];
wgt=[2 4 7 5 3 3 2 2 2 3 11 1];

%Find the size of the array X
[numpop,lenx]=size(X);
out=zeros(numpop,1);

ValuX=sum(X.*repmat(val,numpop,1),2);  %Total value
WghtX=sum(X.*repmat(wgt,numpop,1),2);  %Total weight

for j=1:numpop
    if WghtX(j)<=20         % We have a 20 kg weight limit (otherwise, the
        out(j)=ValuX(j);    %  output is 0)
    end
end