PetscMatTools.hpp

/*

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*/

#ifndef _PETSCMATTOOLS_HPP_
#define _PETSCMATTOOLS_HPP_

#include "UblasMatrixInclude.hpp" // needs to be 'first'
#include "PetscTools.hpp"
#include <vector>
#include <petscvec.h>
#include <petscmat.h>

class PetscMatTools
{
public:

    static void SetElement(Mat matrix, PetscInt row, PetscInt col, double value);

    static void AddToElement(Mat matrix, PetscInt row, PetscInt col, double value);

    static void Finalise(Mat matrix);

    static void SwitchWriteMode(Mat matrix);

    static void Display(Mat matrix);

    static void SetRow(Mat matrix, PetscInt row, double value);

    static void ZeroRowsWithValueOnDiagonal(Mat matrix, std::vector<unsigned>& rRows, double diagonalValue);

    static void ZeroRowsAndColumnsWithValueOnDiagonal(Mat matrix, std::vector<unsigned> rowColIndices, double diagonalValue);

    static void ZeroColumn(Mat matrix, PetscInt col);

    static void Zero(Mat matrix);

    static unsigned GetSize(Mat matrix);

    static void GetOwnershipRange(Mat matrix, PetscInt& lo, PetscInt& hi);

    static double GetElement(Mat matrix, PetscInt row, PetscInt col);

    static void SetOption(Mat matrix, MatOption option);

    static Vec GetMatrixRowDistributed(Mat matrix, unsigned rowIndex);

    static bool CheckEquality(const Mat mat1, const Mat mat2, double tol=1e-10);

    static bool CheckSymmetry(const Mat matrix, double tol=1e-10);

    static void TurnOffVariableAllocationError(Mat matrix);

    template<size_t MATRIX_SIZE>
    static void AddMultipleValues(Mat matrix, unsigned* matrixRowAndColIndices, c_matrix<double, MATRIX_SIZE, MATRIX_SIZE>& rSmallMatrix)
    {
        PetscInt matrix_row_indices[MATRIX_SIZE];
        PetscInt num_rows_owned = 0;
        PetscInt global_row;
        PetscInt lo, hi;
        GetOwnershipRange(matrix, lo, hi);

        for (unsigned row = 0; row<MATRIX_SIZE; row++)
        {
            global_row = matrixRowAndColIndices[row];
            if (global_row >= lo && global_row < hi)
            {
                matrix_row_indices[num_rows_owned++] = global_row;
            }
        }

        if ( num_rows_owned == MATRIX_SIZE)
        {
            MatSetValues(matrix,
                         num_rows_owned,
                         matrix_row_indices,
                         MATRIX_SIZE,
                         (PetscInt*) matrixRowAndColIndices,
                         rSmallMatrix.data(),
                         ADD_VALUES);
        }
        else
        {
            // We need continuous data, if some of the rows do not belong to the processor their values
            // are not passed to MatSetValues
            double values[MATRIX_SIZE*MATRIX_SIZE];
            unsigned num_values_owned = 0;
            for (unsigned row = 0; row < MATRIX_SIZE; row++)
            {
                global_row = matrixRowAndColIndices[row];
                if (global_row >= lo && global_row < hi)
                {
                    for (unsigned col = 0; col < MATRIX_SIZE; col++)
                    {
                        values[num_values_owned++] = rSmallMatrix(row, col);
                    }
                }
            }

            MatSetValues(matrix,
                         num_rows_owned,
                         matrix_row_indices,
                         MATRIX_SIZE,
                         (PetscInt*) matrixRowAndColIndices,
                         values,
                         ADD_VALUES);
        }
    }
};

#endif //_PETSCMATTOOLS_HPP_