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package org.apache.mahout.math.ssvd;
wraps appropriate eigen solver for BBt matrix. Can be either colt or apache commons math.

At the moment it is apache commons math which is only in mahout-math dependencies.

I will be happy to switch this to Colt eigensolver if it is proven reliable (i experience internal errors and unsorted singular values at some point). But for now commons-math seems to be more reliable.

public class EigenSolverWrapper {
  private final double[] eigenvalues;
  private final double[][] uHat;
  public EigenSolverWrapper(double[][] bbt) {
    int dim = bbt.length;
     = evd2.getRealEigenvalues();
    RealMatrix uHatrm = evd2.getV();
     = new double[dim][];
    for (int i = 0; i < dimi++) {
      [i] = uHatrm.getRow(i);
  public double[][] getUHat() {
    return ;
  public double[] getEigenValues() {
    return ;
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