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

Introduction

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

Prototype

public Matrix getU() 

Source Link

Document

Returns the left singular vectors U.

Usage

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

License:Open Source License

public void compute() {
    // Use Colt's SVD
    SingularValueDecomposition svd;
    if (A.columns() > A.rows()) {
        svd = new SingularValueDecomposition(new DenseMatrix(A.viewDice().toArray()));
        V = toColtMatrix(svd.getU());
        U = toColtMatrix(svd.getV());//from   w  w  w .ja  v a2s  . c  om
    } 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);
    }
}

---