GAMS World Forum

Dear experts

I need Convert to find the Hessian in an optimal point of a model. The manual says the following option statement should invoke the solver convert: option modeltype=convert;
but my GAMS system (31.2.0 r8ba6aed WEX-WEI x86 64bit/MS Windows) says that "modeltype" is an invalid option.

Previously I started convert via the solve statement like: SOLVE NLA MAXIMIZING LH USING CONVERT;
but that is not working either.

best
Oyvind

Oyvind,

You don't say what the model type is but since you mention a Hessian I'll guess you're solving an NLP. In this case, your can select the convert solver by the statement in your GAMS code. Assuming my guess on the model type was correct, you then solve with -Steve

Thanks Steven

I should have guessed that modeltype needed to replaced. The Hessian is not found with "convert" but with "convertd", though.

Oyvind