[f,J]=LSBox(x)

function [f,J]=LSBox(x)
t=(0:.1:2)';
v1=exp(-t*x(1));v2=exp(-t*x(2));v3=exp(-t)-exp(-10*t);
f=v1-v2-x(3)*v3;
J=[];
J=[-t.*v1 t.*v2 -v3];
if nargin==2
    J=[-t.*v1 t.*v2 -v3];
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%