Inverse of matrix in java

Answer 1

import java.util.Scanner;

public class Exercise07_23 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

System.out.print("Enter a11, a12, a13, a21, a22, a23, a31, a32, a33: ");

double[][] A = new double[3][3];

for (int i = 0; i < 3; i++)

for (int j = 0; j < 3; j++)

A[i][j] = input.nextDouble();

double[][] inverseOfA = inverse(A);

printMatrix(inverseOfA);

}

public static void printMatrix(double[][] m) {

// ????

}

public static double[][] inverse(double[][] A) {

double[][] result = new double[A.length][A.length];

// Compute |A|

double determinantOfA = 1; // A[0][0] * A[1][1] * A[2][2] * ...;

result[0][0] = (A[1][1] * A[2][2] - A[1][2] * A[2][1]) / determinantOfA;

result[0][1] = 1; // ??

result[0][2] = 1; // ??

result[1][0] = 1; // ??

return result;

}

}