PageRank

public class PageRank {

  public static void main(String[] argv) {
    int[][] data = { 
      { 2, 3, 4, 5, 7 }, 
      { 1 }, 
      { 1, 2 }, 
      { 2, 3, 5 },
      { 1, 3, 4, 6 },
      { 1, 5 }, 
      { 5 } 
    };

    double[][] a = new double[data.length][data.length];
    for (int i = 0; i < data.length; i++) {
      for (int j = 0; j < data[i].length; j++) {
        a[data[i][j] - 1][i] = 1.0 / data[i].length;
      }
    }
    double[] eigVector = new Matrix(a).eigenDecomposition().getV().transpose().getArray()[0];
    double norm1 = new Matrix(eigVector , eigVector .length).norm1();
    for (int i = 0; i < eigVector.length; i++)
      System.out.println(eigVector[i] / norm1);
  }
}