[Ipopt] reuse information of objective function e.g. in the constraint function

[Dominik Skanda]

Hi all:
My questions are:
1)
if i have to calculate expensive values both in the objective and e.g in the 
constraint function depending on the optimization variables (They are the 
same).
 
Is it possible to pass the results of these values to other functions e.g. 
gradient, jacobian and so on to save computational power.
2)
If it is possible, is it possible for the matlab interface, too
3) what have i to take care, if I'm doing so

thanks a lot

dominik