[Couenne] Smallish optimization problem

[Juhani Miettunen]

Hello all,



We have a sawmill ERP SW product done with Microsoft tools. Programming
language is C#. A new feature for the product requires mixer integer
optimization with quadrative objective (least squares). Problem is quite
small, some data from the NEOS result report below.



I made an AMPL model about the problem and Couenne works fine with it. I
used NEOS web service for the testing. Other solvers seem to work fine as
well, including CBC.



A few questions:

   - Is Couenne and all the libraries used by it under EPL license (or
   other business friendly license)
   - Is there a suitable API available for Microsoft .NET and C#
   - Is there an easy way to convert the AMPL model to .nl or directly to
   suitable matrices without AMPL license



Any good advice how to get Couenne embedded to our SW package?



Kind Regards,

Juhani







You are using the solver couenne.

Checking ampl.mod for couenne_options...

Checking ampl.com for couenne_options...

Executing AMPL.

processing data.

processing commands.

Executing on prod-exec-3.neos-server.org



Presolve eliminates 53 constraints and 1 variable.

Adjusted problem:

21 variables:

        10 binary variables

        11 nonlinear variables

19 constraints, all linear; 64 nonzeros

        19 inequality constraints

1 nonlinear objective; 11 nonzeros.
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