Hey everybody I really need help on a problem in a Java code. Any help would be really appreciated. The problem is to :
Write a test program that prompts the user to enter a11, a12, a13, a21, a22, a23, a31, a32, a33 for a matrix and displays its inverse matrix. Here is the sample runs:
Enter a11, a12, a13, a21, a22, a23, a31, a32, a33: 1 2 1 2 3 1 4 5 3
-2 0.5 0.5
1 0.5 -0.5
1 -1.5 0.5
Can any one fill in the blanks and explain please.
This is what i got so far:
import java.util.Scanner;
public class MatrixProblem {
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;
}
}
