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+//Find x in R^2 such that:
+// An Unbounded Example
+
+function y = fun(x)
+ y = -(x(1)^2 + x(2)^2);
+endfunction
+x0 = [1,2];
+options=list("MaxIter", [1500], "CpuTime", [500], "Gradient", "OFF", "Hessian", "OFF");
+
+//Output
+//
+//Iterates diverging; problem might be unbounded.
+// hessian =
+//
+// []
+// gradient =
+//
+// []
+// output =
+//
+// Iterations: 65
+// Cpu_Time: 0.112
+// Message: "Iterates diverging; problem might be unbounded"
+// exitflag =
+//
+// 8
+// fopt =
+//
+// []
+// xopt =
+//
+// []
+
+[xopt,fopt,exitflag,output,gradient,hessian] = fminunc (fun, x0, options)
+