[Ipopt] gradient of the Lagrangien

sebastien lengagne lengagne at gmail.com
Tue Aug 31 21:37:16 EDT 2010

Dear all,

I am using IPOPT, and I would like to test other Hessian approximation 
(sparse one).

To get the data I need, I implemented the *intermediate_callback 
*function*. *Through the *IpoptCalculatedQuantities* ip_cq, *I can have 
the vector of the Lagrangian like this:

*SmartPtr<const Vector> x =  ip_cq->curr_grad_lag_x();*

I can know the size of this vector like this:

*size = x->Dim();*
*But I do not know how I can know the values of each component of this 

*I checked the help and the *IpVector.hpp* file but I did not find anything

Does anybody know how to do it ?*
best regards

Sébastien LENGAGNE, Ph.D
CNRS-AIST JRL(Joint Robotics Laboratory), UMI3218/CRT
AIST Central 2, 1-1-1 Umezono, Tsukuba, 305-8568 JAPAN
tel : +81-29-8626508
fax : +81-29-8626507
mail : sebastien.lengagne at aist.go.jp
website : http://staff.aist.go.jp/sebastien.lengagne/

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