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matrix solution code in java

Powerful Puffin answered on August 29, 2022 Popularity 3/10 Helpfulness 1/10

answer matrix solution code in java

matrix solution code in java

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// Java program to find
// Determinant of a matrix
class GFG {
 
    // Dimension of input square matrix
    static final int N = 2;
 
    // Function to get cofactor of
    // mat[p][q] in temp[][]. n is
    // current dimension of mat[][]
    static void getCofactor(int mat[][], int temp[][],
                            int p, int q, int n)
    {
        int i = 0, j = 0;
 
        // Looping for each element
        // of the matrix
        for (int row = 0; row < n; row++) {
            for (int col = 0; col < n; col++) {
                // Copying into temporary matrix
                // only those element which are
                // not in given row and column
                if (row != p && col != q) {
                    temp[i][j++] = mat[row][col];
                    // Row is filled, so increase
                    // row index and reset col index
                    if (j == n - 1) {
                        j = 0;
                        i++;
                    }
                }
            }
        }
    }
 
    /* Recursive function for finding determinant
    of matrix. n is current dimension of mat[][]. */
    static int determinantOfMatrix(int mat[][], int n)
    {
        int D = 0; // Initialize result
 
        // Base case : if matrix
        // contains single element
        if (n == 1)
            return mat[0][0];
 
        // To store cofactors
        int temp[][] = new int[N][N];
 
        // To store sign multiplier
        int sign = 1;
 
        // Iterate for each element of first row
        for (int f = 0; f < n; f++) {
            // Getting Cofactor of mat[0][f]
            getCofactor(mat, temp, 0, f, n);
            D += sign * mat[0][f]
                 * determinantOfMatrix(temp, n - 1);
 
            // terms are to be added
            // with alternate sign
            sign = -sign;
        }
 
        return D;
    }
 
    /* function for displaying the matrix */
    static void display(int mat[][], int row, int col)
    {
        for (int i = 0; i < row; i++) {
            for (int j = 0; j < col; j++)
                System.out.print(mat[i][j]);
 
            System.out.print("\n");
        }
    }
 
    // Driver code
    public static void main(String[] args)
    {
 
        int mat[][] = { { 4, 3 }, { 2, 3 } };
 
        System.out.print("Determinant "
                         + "of the matrix is : "
                         + determinantOfMatrix(mat, N));
    }
}

Popularity 3/10 Helpfulness 1/10 Language java

Source: www.geeksforgeeks.org

Tags: java matrix solution

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Contributed on Aug 29 2022

Powerful Puffin

0 Answers Avg Quality 2/10

matrix solution code in java

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