<p><font color="#3333ff">Dear All</font></p>
<p><font color="#3333ff">In my application, it is cheaper to calculate product of hessian of lagrangian with a vector, instead of direct calculation of hessian, is it any way to ambed such thing in "Ipopt" and avoid from intensive work.
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<p><font color="#3333ff">Regards, ... rt.</font></p>