[ojAlgo-user] IntegerSolver issue

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

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