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function [gk, Gk] = nonlinear_ok_box_g(k, xk1)
global nonlinear_ok_box_x1
global nonlinear_ok_box_dt
if k == 1
Gk = zeros(4, 4);
gk = nonlinear_ok_box_x1;
return;
end
dt = nonlinear_ok_box_dt;
Gk = [ ...
1 0 0 0
dt 1 0 0
0 0 1 0
0 0 dt 1 ...
];
gk = Gk * xk1;
return
end