Matrix

Reading and Printing Matrix

import java.util.Scanner;

public class MatrixInput {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        // Reading number of rows and columns

        System.out.println("Enter the number of rows:");
        int rows = scanner.nextInt();
        System.out.println("Enter the number of columns:");
        int columns = scanner.nextInt();

        // Initializing the matrix

        int[][] matrix = new int[rows][columns];

        // Reading the matrix elements

        System.out.println("Enter the elements of the matrix:");

        for (int i = 0; i < rows; i++) {

            for (int j = 0; j < columns; j++) {

                matrix[i][j] = scanner.nextInt();

            }

        }

        // Displaying the matrix

        System.out.println("The matrix is:");

        for (int i = 0; i < rows; i++) {

            for (int j = 0; j < columns; j++) {

                System.out.print(matrix[i][j] + " ");

            }

            System.out.println();

        }

        scanner.close();

    }

}

***************************************************************************
Matrix Addition
public class MatrixAddition {
public static void main(String[] args) {
int rows = 2, columns = 3;
int[][] firstMatrix = { {2, 3, 4}, {5, 2, 3} };
int[][] secondMatrix = { {1, 5, 2}, {4, 3, 2} };

// Adding two matrices

int[][] sum = new int[rows][columns];
for(int i = 0; i < rows; i++) {
    for (int j = 0; j < columns; j++) {
            sum[i][j] = firstMatrix[i][j] + secondMatrix[i][j];
}
}

// Displaying the result
System.out.println("Sum of two matrices is: ");
for(int[] row : sum) {
    for (int column : row) {
        System.out.print(column + " ");
}
System.out.println();
}
}
}
*****************************************************************
Matrix Multiplication
public class MatrixMultiplication {
    public static void main(String[] args) {
        int rows1 = 2, columns1 = 3;
        int rows2 = 3, columns2 = 2;
        int[][] firstMatrix = { {2, 3, 4}, {5, 2, 3} };
        int[][] secondMatrix = { {3, 4}, {1, 2}, {5, 6} };

        // Multiplying two matrices
        int[][] product = new int[rows1][columns2];
        for(int i = 0; i < rows1; i++) {
            for (int j = 0; j < columns2; j++) {
                for (int k = 0; k < columns1; k++) {
                    product[i][j] += firstMatrix[i][k] * secondMatrix[k][j];
                }
            }
        }

        // Displaying the result
        System.out.println("Product of two matrices is: ");
        for(int[] row : product) {
            for (int column : row) {
                System.out.print(column + "    ");
            }
            System.out.println();
        }
    }
}
*************************************************************************
Matrix Transpose

public class MatrixTranspose {
    public static void main(String[] args) {
        int rows = 2, columns = 3;
        int[][] matrix = { {2, 3, 4}, {5, 6, 7} };

        // Transposing the matrix
        int[][] transpose = new int[columns][rows];
        for(int i = 0; i < rows; i++) {
            for (int j = 0; j < columns; j++) {
                transpose[j][i] = matrix[i][j];
            }
        }

        // Displaying the result
        System.out.println("Transpose of the matrix is: ");
        for(int[] row : transpose) {
            for (int column : row) {
                System.out.print(column + "    ");
            }
            System.out.println();
        }
    }
}
***************************************************************
Find smallest element in each row

import java.util.Scanner;

public class SmallestElementInRows {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Reading number of rows and columns
        System.out.println("Enter the number of rows:");
        int rows = scanner.nextInt();
        System.out.println("Enter the number of columns:");
        int columns = scanner.nextInt();

        // Initializing the matrix
        int[][] matrix = new int[rows][columns];

        // Reading the matrix elements
        System.out.println("Enter the elements of the matrix:");
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < columns; j++) {
                matrix[i][j] = scanner.nextInt();
            }
        }

        // Finding the smallest element in each row
        for (int i = 0; i < rows; i++) {
            int smallest = matrix[i][0];
            for (int j = 1; j < columns; j++) {
                if (matrix[i][j] < smallest) {
                    smallest = matrix[i][j];
                }
            }
            System.out.println("The smallest element in row " + (i + 1) + " is: " + smallest);
        }

        scanner.close();
    }
}

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