public Matrix<T, A> add(Matrix<T, A> right) throws MatrixException { Matrix<T, A

Question

public Matrix<T, A> add(Matrix<T, A> right) throws MatrixException { Matrix<T, A> temp = new Matrix<T, A>(arithmetics, rowSize, columnSize);
if (rowSize != right.rowSize || columnSize != right.columnSize) throw new MatrixException("Cannot add matrices of different sizes");
setup(temp, rowSize, columnSize);
for (int i = 0; i < rowSize; ++i) { for (int j = 0; j < columnSize; ++j) temp.matrix[i][j] = arithmetics.add(matrix[i][j], right.matrix[i][j]); }
return temp; }
// TODO Implement subtract and multiply methods similar to add method
public Matrix<T, A> subtract(Matrix<T, A> right) throws MatrixException { Matrix<T, A> temp = new Matrix<T, A>(arithmetics, rowSize, columnSize);
if (rowSize != right.rowSize || columnSize != right.columnSize) throw new MatrixException("Cannot subtract matrices of different sizes");
setup(temp, rowSize, columnSize);
for (int i = 0; i < rowSize; ++i) { for (int j = 0; j < columnSize; ++j) temp.matrix[i][j] = arithmetics.subtract(matrix[i][j], right.matrix[i][j]); } return temp; }
public Matrix<T, A> add(Matrix<T, A> right) throws MatrixException { Matrix<T, A> temp = new Matrix<T, A>(arithmetics, rowSize, columnSize);
if (rowSize != right.rowSize || columnSize != right.columnSize) throw new MatrixException("Cannot add matrices of different sizes");
setup(temp, rowSize, columnSize);
for (int i = 0; i < rowSize; ++i) { for (int j = 0; j < columnSize; ++j) temp.matrix[i][j] = arithmetics.add(matrix[i][j], right.matrix[i][j]); }
return temp; }
// TODO Implement subtract and multiply methods similar to add method
public Matrix<T, A> subtract(Matrix<T, A> right) throws MatrixException { Matrix<T, A> temp = new Matrix<T, A>(arithmetics, rowSize, columnSize);
if (rowSize != right.rowSize || columnSize != right.columnSize) throw new MatrixException("Cannot subtract matrices of different sizes");
setup(temp, rowSize, columnSize);
for (int i = 0; i < rowSize; ++i) { for (int j = 0; j < columnSize; ++j) temp.matrix[i][j] = arithmetics.subtract(matrix[i][j], right.matrix[i][j]); } return temp; }

Explanation / Answer

#include <iostream>

int main()
{
     int arr1[20][20],arr2[10][10];
     int result[20][20];
     int m,n;
     int i,j;
     // prompts the user to enter the rows and columns of the matrix
     std::cout<<" Enter the number of rows (m) : ";
     std::cin>>m;
     std::cout<<" Enter the number of columns (n) : ";
     std::cin>>n;
     std::cout<<" Enter the elements of the 1st matrix ";

     for (i=0; i<m; i++)
     {
          for (j=0; j<n; j++)
          {
               std::cout<<" Element "<<i<<" : "<<j<<" --> ";
               std::cin>>arr1[i][j];
          }
     }

     std::cout<<" Enter the elements of the 2nd matrix : ";
     for (i=0; i<m; i++)
     {
          for (j=0; j<n; j++)
          {
               std::cout<<" Element "<<i<<" : "<<j<<" --> ";
               std::cin>>arr2[i][j];
          }
     }

     //------------ display matrics -----------------------

     std::cout<<" 1st matrix ";
     for (i=0; i<m; i++)
     {
          for (j=0; j<n; j++)
          {
               std::cout<<" "<<arr1[i][j];
          }
          std::cout<<" ";
     }

     std::cout<<" 2nd matrix ";
     for (i=0; i<m; i++)
     {
          for (j=0; j<n;j++)
          {
               std::cout<<" "<<arr2[i][j];
          }
          std::cout<<" ";
     }
    std::cout<<" Resultatn matrix ";
    int k=0;
     // multiplies the two matrices together
     for(i=0;i< m;i++)
     {
          for(j=0;j< n;j++)
          {
               result[i][j] = 0;
          for(k=0;k< m;k++)
          {
               result[i][j] = result[i][j] + arr1[i][k] * arr2[k][j];
          }
          } // end of j sub loop
     } // end of i main loop

     // displays the resultant matrix

     for (i=0; i<m; i++)
     {
          for (j=0; j<n; j++)
          {
               std::cout<<result[i][j]<<" ";
          }
          std::cout<<" ";
     }
     return 0;
} // end of main

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