random.C

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License
    This file is part of OpenFOAM.
 
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#include "random.H"
#include "clock.H"
#include "randomGenerator.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace decompositionMethods
{
    defineTypeNameAndDebug(random, 0);
 
    addToRunTimeSelectionTable
    (
        decompositionMethod,
        random,
        decomposer
    );
 
    addToRunTimeSelectionTable
    (
        decompositionMethod,
        random,
        distributor
    );
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::decompositionMethods::random::random(const dictionary& decompositionDict)
:
    decompositionMethod(decompositionDict),
    seed_
    (
        decompositionDict.optionalSubDict
        (
            word(decompositionDict.lookup("method")) + "Coeffs"
        ).lookupOrDefault<label>("seed", clock::getTime())
    )
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::labelList Foam::decompositionMethods::random::decompose
(
    const polyMesh& mesh,
    const pointField& points,
    const scalarField& pointWeights
)
{
    checkWeights(points, pointWeights);
 
    randomGenerator rndGen(seed_, true);
 
    // Simple random integer. No guarantees about balance.
    /*
    labelList result(points.size());
    forAll(result, i)
    {
        result[i] = rndGen.sampleAB<label>(0, nDomains());
    }
    */
 
    // Sorted random scalar. Equal balance.
    scalarList position(points.size());
    forAll(points, i)
    {
        position[i] = rndGen.sample01<scalar>();
    }
 
    labelList order(points.size());
    sortedOrder(position, order);
 
    labelList result(points.size());
    forAll(points, i)
    {
        result[i] = (nDomains()*order[i])/points.size();
    }
 
    return result;
}
 
 
// ************************************************************************* //