HGridOptimiser.h

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// This file is part of the MercuryDPM project (https://www.mercurydpm.org).
// Copyright (c), The MercuryDPM Developers Team. All rights reserved.
// License: BSD 3-Clause License; see the LICENSE file in the root directory.
 
#ifndef HGRIDOPTIMIZER_H
#define HGRIDOPTIMIZER_H
 
#include <vector>
#include "MercuryBase.h"
 
class HGridOptimiser
{
public:
    void initialise(const MercuryBase& problem, unsigned int numberOfCells, int verbosity);
    
    void initialisePolyFunc(double omega, std::vector<double>& coeff, unsigned int numberOfCells, int verbosity);
    
    unsigned int radius2Cell(double r);
    
    unsigned int radius2IntCell(double r);
    
    double intCell2Min(unsigned int i);
    
    double intCell2Max(unsigned int i);
    
    double cell2Min(unsigned int i);
    
    double cell2Max(unsigned int i);
    
    double pdfIntCell(double start, double end, unsigned int i, int p);
    
    double pdfInt(double start, double end, int power);
    
    double diffPdfInt(double x, int power);
    
    double expectedCellsIntegralCellNumerator(double start, double end, unsigned int i, int p, double h);
    
    double diffHExpectedCellsIntegralCellNumerator(double start, double end, unsigned int i, int p, double h);
    
    double expectedCellsIntegralCellDenominator(double start, double end, unsigned int i);
    
    double expectedCellsIntegral(double start, double end, int p, double h);
    
    double diffStartExpectedCellsIntegral(double start, double end, int p, double h);
    
    double diffEndExpectedCellsIntegral(double start, double end, int p, double h);
    
    double diffHExpectedCellsIntegral(double start, double end, int p, double h);
    
    double calculateWork(std::vector<double>& hGridCellSizes, HGridMethod method, int verbosity);
    
    void calculateDiffWork(std::vector<double>& hGridCellSizes, std::vector<double>& dfdx, HGridMethod method,
                           int verbosity);
    
    void calcDfDx(std::vector<double>& hGridCellSizes, std::vector<double>& dfdx, HGridMethod method, int verbosity);
    
    double checkLimit(std::vector<double>& hGridCellSizes, std::vector<double>& dfdx, int verbosity);
    
    void applyStep(std::vector<double>& hGridCellSizes, std::vector<double>& dfdx, double stepsize, int verbosity);
    
    double
    goldenSectionSearch(std::vector<double>& startHGridCellSizes, std::vector<double>& searchDirection, double min,
                        double cur, double max, HGridMethod method, int verbosity);
    
    void getOptimalDistribution(std::vector<double>& hGridCellSizes, unsigned int numberOfLevels, HGridMethod method,
                                int verbosity);
    
    void histNumberParticlesPerCell(std::vector<double>& hGridCellSizes);
 
private:
    unsigned int numCells_;
    double rMin_;
    double rMax_;
    double length_;
    double cellCheckOverContactCheckRatio_;
    unsigned int dimension_;
    
    //Something with cells. Still have to find out which property the double represents.
    //Could be the number of particles in that cell (see initialise), but then 
    //you'd expect an unsigned int and not a double.
    std::vector<double> cellN_;
    std::vector<double> intCellN;
};
 
#endif