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RowColumnSparseMatrix.cpp

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// RowColumnSparseMatrix.cpp: implementation of the RowColumnSparseMatrix class.
//

#include "RowColumnSparseMatrix.h"

// Construction/Destruction

RowColumnSparseMatrix::RowColumnSparseMatrix(int nRows, int nCols)
:SparseMatrix(nRows,nCols)
{

}

RowColumnSparseMatrix::~RowColumnSparseMatrix()
{
        for(int i = 0; i < matrix.size(); i++)
        {
                delete matrix[i];
        }
}

bool RowColumnSparseMatrix::AddElement(int row, int col, int value)
{
        // create a matrix element
        RowColumnSparseMatrix::MatrixElement *elem = new RowColumnSparseMatrix::MatrixElement(row,col,value);
        // push it onto the list
        matrix.push_back(elem);

        return true;
}

void RowColumnSparseMatrix::OrderElements()
{
        return;
}

bool RowColumnSparseMatrix::RightVectorMultiply(double *colVector, int length)
{
        // check for size compatibility
        if(length != nCols)
        {
                return false;
        }

        // temporarily stores result of multiplication
        double *sums = new double[nCols];
        for(int i = 0; i < nCols; i++)
        {
                sums[i] = 0.0;
        }

        for(int index = 0; index < matrix.size(); index++)
        {       
                int mI = matrix[index]->GetRow();
                int mJ = matrix[index]->GetCol();
                double mElem = matrix[index]->GetValue();

                sums[mI] += mElem*colVector[mJ];
        }

        for(int i = 0; i < nCols; i++)
        {
                colVector[i] = sums[i];
        }
        delete [] sums;

        return true;
}

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