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// gradient should be provided when hessian is ON
function [y] = f(x)
y = -x(1)^2 - x(2)^2;
h = [-2,0];
endfunction
x0=[2,1];
intcon = [1]
options = list("hessian","ON");
// !--error 10000
// intfminunc: Gradient of objective function is not provided
// at line 238 of function intfminunc called by :
// [xopt,fopt,exitflag,gradient,hessian]=intfminunc(f,x0,intcon,options)
// at line 9 of exec file called by :
// exec intfminuc_hessian4.sce
[xopt,fopt,exitflag,gradient,hessian]=intfminunc(f,x0,intcon,options)
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