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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
grad=[];
x0=[2,1];
intcon = [1]
options = list("gradobj",grad);
// !--error 10000
// intfminbnd_options: Expected type ["string"] for input argument gradobj at input #2, but got "constant" instead.
// at line 56 of function Checktype called by :
// at line 194 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_gradient3.sce
[xopt,fopt,exitflag,gradient,hessian]=intfminunc(f,x0,intcon,options)
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