function elev=testfunction(loc)
% Cost function for the longitude-latitude example
%
% Carr 2014
[m,n]=size(loc);
for i=1:m
    x=loc(i,1);
    if x>10
        x=10;
    elseif x<0
        x=0;
    end
    y=loc(i,2);
    if y>10
        y=10;
    elseif y<0
        y=0;
    end
    elev(i)=x*sin(4*x)+1.1*y*sin(2*y);
end