Thursday, August 7, 2008

Program to perform operations like addition, multiplicaton, etc. on matrix

Program to perform operations like addition, multiplicaton, etc. on matrix(Source Code)
// Program Ch02pr03
// Program to perform operations like addition, multiplicaton, etc. on matrix

#include
#include

using namespace std;

const int MAX = 3 ;

class matrix
{
    private :

        int **mat ;
        int sz1, sz2;

    public :

        matrix( int siz1, int siz2) ;
        void create( ) ;
        void display( ) ;
        void matadd ( matrix &m1, matrix &m2 ) ;
        void matmul ( matrix &m1, matrix &m2 ) ;
        void transpose ( matrix &m1 ) ;
} ;



// initializes the matrix mat with 0
matrix :: matrix(int siz1,int siz2 )
{
    sz1=siz1;
    sz2=siz2;
}

// creates matrix mat
void matrix :: create( )
{
    int n ;
    const int siz2=sz2;
   
    mat = new int[sz1][MAX];

    for ( int i = 0 ; i < sz1; i++ )
    {
        for ( int j = 0 ; j < sz2; j++ )
        {
            cout << "\nEnter the element : " ;
            cin >> n ;
            mat[i][j] = n ;
        }
    }
}

// displays the contents of matrix
void matrix :: display( )
{
    for ( int i = 0 ; i < sz1 ; i++ )
    {
        for ( int j = 0 ; j < sz2 ; j++ )
            cout << mat[i][j] << "  " ;
        cout << endl ;
    }
}

// adds two matrices m1 and m2
void matrix :: matadd ( matrix &m1, matrix &m2 )
{
    for ( int i = 0 ; i < m1.sz1 ; i++ )
    {
        for ( int j = 0 ; j < m1.sz2 ; j++ )
            mat[i][j] = m1.mat[i][j] + m2.mat[i][j] ;
    }
}

// multiplies two matrices m1 and m2
void matrix :: matmul ( matrix &m1, matrix &m2 )
{
    for ( int k = 0 ; k < m1.sz1 ; k++ )
    {
        for ( int i = 0 ; i < m2.sz2 ; i++ )
        {
            for ( int j = 0 ; j < m1.sz2 ; j++ )
                mat[k][i] += m1.mat[k][j] * m2.mat[j][i] ;
        }
    }
}

// obtains transpose of matrix m1
void matrix :: transpose ( matrix &m1 )
{
    for ( int i = 0 ; i < sz1 ; i++ )
    {
        for ( int j = 0 ; j < sz2 ; j++ )
            mat[i][j] = m1.mat[j][i] ;
    }
}

int main( )
{
    matrix mat1(MAX, MAX) , mat2(MAX, MAX);
    cout << "\nEnter elements for first array: \n" ;
    mat1.create( ) ;

   
    cout << "\nEnter elements for second array: \n" ;
    mat2.create( ) ;

    cout << "\nFirst Array: \n" ;
    mat1.display( ) ;
    cout << "\nSecond Array:\n" ;
    mat2.display( ) ;

    matrix mat3 (MAX, MAX);
    mat3.matadd ( mat1, mat2 ) ;
    cout << "\nAfter Addition: \n" ;
    mat3.display( ) ;

    matrix mat4(MAX,MAX) ;
    mat4.matmul ( mat1, mat2 ) ;
    cout << "\nAfter Multiplication: \n" ;
    mat4.display( ) ;

    matrix mat5(MAX, MAX) ;
    mat5.transpose ( mat1 ) ;
    cout << "\nTranspose of first matrix: \n" ;
    mat5.display( ) ;
    getch();
}

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