function [f,grad_f,Hess_f] = unknown_3d(y)
    

% Translation für Lösung anhand des Datums:
x1=y(1)-5;
x2=y(2)-11;
x3=y(3)-19;
%
f=100*(x2-x1.^2).^2 + (1-x1).^2 + (x3-1).^2 + 19;
grad_f=[200*(x2-x1.^2)*(-2*x1) - 2*(1-x1) , ...
        200*(x2-x1.^2), ...
        2*(x3-1)];
Hess_f=[-400*(x2-3*x1.^2) + 2 , -400*x1 , 0;...
        -400*x1               ,  200    , 0;...
         0                    ,  0      , 2]; 
    
end
