Inverse of a matrix in java

Question

I would like to calculate an inverse of matrix in java. Are there any already existing packages which calculate inverse of matrix. I found similar question, but the answers in the questions are not so strongly recommending to use anyof the packages. Even i could not follow the method they are using. I have a large matrix of 10000s of rows and columns. I would like to calculate inverse of it.

score 3 · Answer 1 · answered May 21 '12 at 13:34

3

Apache Commons Math have support for linear algebra

answered May 21 '12 at 13:34

JustDanyul

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score 2 · Accepted Answer · answered May 21 '12 at 13:34

2

I think you should give a shot to JAMA

The documentation presents an inverse function for matrices http://math.nist.gov/javanumerics/jama/doc/

Seeing the size of your matrix though, You WILL have to factorize it first .

answered May 21 '12 at 13:34

jlengrand

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I believe jama is discontinued, last release was on 2005-07-13 – JustDanyul May 21 '12 at 13:38
1

Yep, saw it too. I didn't know about Apache lib. Thanks for letting us know – jlengrand May 21 '12 at 13:46

score 1 · Answer 3 · answered Feb 08 '13 at 05:15

The la4j (Linear Algebra for Java) library supports matrix inversion. Here is the short example:

Matrix a = new Basic2DMatrix(new double[][]{
   { 1.0, 2.0, 3.0 },
   { 4.0, 5.0, 6.0 },
   { 7.0, 8.0. 9.0 }
});

Matrix b = a.invert(Matrices.DEFAULT_INVERTOR); // uses Gaussian Elimination

score -1 · Answer 4 · answered Sep 01 '14 at 11:59

there is a example in github used Linear Algebra for Java

Matrix a =                                               
             factory.createMatrix(new RandomMatrixSource(SIZE,SIZE));
MatrixInverter inverter = a.withInverter(LinearAlgebra.GAUSS_JORDAN);
         Matrix e = inverter.inverse(factory);

Inverse of a matrix in java

4 Answers4