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// Check if a user specifies correct format of gradient function or not
function [y] = f(x)
y = -x(1)^2 - x(2)^2;
endfunction
x0=[2,1];
intcon = [1]
options = list("gradobj","");
// !--error 999
// Unknown string passed in gradobj.
// at line 200 of function intfminunc called by :
// [xopt,fopt,exitflag,gradient,hessian]=intfminunc(f,x0,intcon,options)
// at line 8 of exec file called by :
// exec intfminuc_gradient2.sce
[xopt,fopt,exitflag,gradient,hessian]=intfminunc(f,x0,intcon,options)
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