Example usage for org.apache.mahout.math SingularValueDecomposition SingularValueDecomposition

Introduction

In this page you can find the example usage for org.apache.mahout.math SingularValueDecomposition SingularValueDecomposition.

Prototype

public SingularValueDecomposition(Matrix arg) 

Source Link

Document

Constructs and returns a new singular value decomposition object; The decomposed matrices can be retrieved via instance methods of the returned decomposition object.

Usage

From source file:org.carrot2.matrix.factorization.PartialSingularValueDecomposition.java

License:Open Source License

public void compute() {
    // Use Colt's SVD
    SingularValueDecomposition svd;//from   w ww.j  a v  a2  s . c  o m
    if (A.columns() > A.rows()) {
        svd = new SingularValueDecomposition(new DenseMatrix(A.viewDice().toArray()));
        V = toColtMatrix(svd.getU());
        U = toColtMatrix(svd.getV());
    } else {
        svd = new SingularValueDecomposition(new DenseMatrix(A.toArray()));
        U = toColtMatrix(svd.getU());
        V = toColtMatrix(svd.getV());
    }

    S = svd.getSingularValues();

    if (k > 0 && k < S.length) {
        U = U.viewPart(0, 0, U.rows(), k);
        V = V.viewPart(0, 0, V.rows(), k);
        S = Arrays.copyOf(S, k);
    }
}

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