[Ipopt] option derivative IPOPT

[josee.lefebvre at videotron.ca]

Hi,

I am currently working with IPOPT on MatLab. 
It work really well, thank you.
I used the derivative test option and I found and error on my numerical derivatives of about 1e-4.
It is not a lot, but I guess it is enough to slow down my resolution.
I didn't found an option to use de derivative done internally by IPOPT. It would be usefull.
Is there a way to use the derivative calculated by IPOPT?

Thank you in advance
Eve Charbonneau (Université de Montréal)
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