[Ipopt] How to "explode" a model with variable on multiple dimensions..

[Antonello Lobianco]

2012/6/27 Novalio Daratha <novatha at gmail.com>

> Hi,
> have you take a look at pyomo?
> Novalio
>

Thank you.. I'm having a look to it, but on this page it is stated that
pyomo works only for linear problems:
http://www.coin-or.org/projects/Coopr.xml
[...]Coopr supports a diverse set of optimization capabilities that can be
used to formulate and analyze optimization applications. In particular, it
include Pyomo, a Python-based modeling tool that can model *abstract linear
and integer programs*.[...]

On the available solver list (
https://software.sandia.gov/trac/coopr/wiki/GettingStarted/Solvers) I can
read only of linear or quadratic solvers, and there isn't IPOPT, that
having tested it in GAMS, is known to work well for my model.

Antonello


>
> On Wed, Jun 27, 2012 at 1:17 PM, Antonello Lobianco <
> antonello at lobianco.org> wrote:
>
>> Hi, thanks for your quick answer.
>> About specifying the derivatives for the Jacobian and the Hessian I was
>> planning to use some AD packages, like ADOL-C.
>> My needs for C++ are of two different nature:
>> 1st) Aside the part of the model that is optimised we have other parts of
>> the model that aren't. These are getting bigger and bigger and simply GAMS
>> is not even closes to the functionality/expressiveness/modularityprovided by a generic programming language.
>> Of course a second option that I may have is to leave the optimisation
>> part in GAMS (or AMPL) and then simple update the data and call gams.
>> However this lead to the second point:
>> 2nd) I'd like this model to be freely available and that
>> people/organisations doesn't need to have a licence for a XY program in
>> order to be able tu run it. Currently to best of my knowledge there are no
>> "free" versions of programs that translate a model from a simple-to-write
>> mathematical formulation to the format required by nonlinear solvers. If
>> you know any, please step in :-)
>>
>> Antonello
>>
>
-- 
Antonello Lobianco
INRA, Laboratoire d'Economie Forestière
14 Rue Girardet - 54000 Nancy, France
Tel: +33.652392310
Email: antonello.lobianco at nancy-engref.inra.fr
http://antonello.lobianco.org
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