Finding inverse of 2d n*n matrix in Java?

Question

I have just printed the matrix of size n*n

Code is (Assume that all matrices are already defined):

public class ReadContents { 
    public static void main(String args[]) {
        System.out.println();
        System.out.println("The Matrix Is:");
        double mat[][]=new double[col][col];

        for(k=0;k<col;k++) {
            for(p=0;p<col;p++) {
                mat[k][p]=SubMULTIPL_1[k][p]-ADD[k][p];
                System.out.printf("%2.2f  ",mat[k][p]);
            }

            System.out.println();
        }
    }

But, I am having the problem of finding the inverse of n*n square matrix
where n=1,2,3..........infinite.

Any help would be appreciated.

http://en.wikipedia.org/wiki/Invertible_matrix#Methods_of_matrix_inversion — Jens Schauder, May 06 '11 at 13:45

score 2 · Answer 1 · edited May 23 '17 at 12:29

2

Some Java matrix math libraries can do the job.
Not every matrix is invertible perhaps you should test if this condition is met.

edited May 23 '17 at 12:29

Community

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answered May 06 '11 at 13:46

Ghassen Hamrouni

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score 2 · Answer 2 · answered May 06 '11 at 14:25

You probably don't want the inverse.

I'm betting that you really want to know how to solve a system of equations. I'd recommend that you look at LU decomposition rather than inverse or Gaussian elimination. It's more stable.

You'll have a hard time inverting a matrix if the determinant of the matrix is zero or VERY small.

Finding inverse of 2d n*n matrix in Java?

2 Answers2