Re: [ojAlgo-user] IntegerSolver issue

[Simon G. <si...@ya...>]

I have read de javadoc for ExpressionsBasedModel, my problem is when I try to build the ExpressionsBasedModel in the same way as in the example in
http://ojalgo.cvs.sourceforge.net/viewvc/ojalgo/TestProj/src/org/ojalgo/optimisation/integer/ 
using:
ExpressionsBasedModel ebm=new ExpressionsBasedModel(tmpVariables);              (tmpVariables is of the type Variable[])

I get an error saying ExpressionsBasedModel is abstract and cannot be instantiated...

 SG




 

________________________________
 From: Anders Peterson <an...@op...>
To: ojAlgo ojAlgo <oja...@li...> 
Sent: Friday, July 20, 2012 7:03 AM
Subject: Re: [ojAlgo-user] IntegerSolver issue
 
You're not the first to ask about ExpressionsBasedModel. That means you should be able to find something useful in the list archives.

http://sourceforge.net/mailarchive/forum.php?forum_name=ojalgo-user
http://sourceforge.net/search/?group_id=79000&type_of_search=mlists

...and/or you can look at the junit tests for the integer solver:

http://ojalgo.cvs.sourceforge.net/viewvc/ojalgo/TestProj/src/org/ojalgo/optimisation/integer/

Did you read the javadoc for ExpressionsBasedModel and Expression?

http://ojalgo.org/generated/org/ojalgo/optimisation/ExpressionsBasedModel.html
http://ojalgo.org/generated/org/ojalgo/optimisation/Expression.html

/Anders


On 19 jul 2012, at 23:19, Simon Greaves wrote:

> Hi, my name is Simon
> I'm trying to use the integer solver in OjAlgo, but I don't understand how to use it. The builder seems to require an ExpressionsBasedModel, which in itself requires a Variable vector. Can you help me out with this? Or point me to an example or documentation regarding this?
> 
> I'm solving
> 
> min  -[X]T[P] / [C]T[X]
> and [C]T[X] <= maxCost
> 
> Where [X] is an integer vector
> [P] is a vector of real values
> [C] is a vector of real values
> maxCost is a real value
> 
> That is, I want X to maximize [X]T[P] and minimize [C]T[X] while remaining under maxCost
> 
> 
> 
> 
> 
> 
> I've used the Quadratic solver before, this is how I used it:
> 
> final QuadraticSolver.Builder tmpBuilder = new QuadraticSolver.Builder(tmpQ, tmpC).equalities(tmpAE, tmpBE).inequalities(tmpAI, tmpBI);
> final QuadraticSolver tmpSolver = tmpBuilder.build();
> final OptimisationSolver.Result tmpResult = tmpSolver.solve();
> final BasicMatrix tmpSolution = tmpResult.getSolution();
> 
> Where I built the MatrixStore objects using:
> final MatrixStore<Double> tmpQ = PrimitiveDenseStore.FACTORY.copy(Q);
> for example...
> 
> 
> Thanks a lot for any help!
> 
> S
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