Examples of org.apache.mahout.math.Vector.assign()

org.apache.mahout.math.Vector.assign()
Assign the value to all elements of the receiver @param value a double value @return the modified receiver

    public Vector next() {
      if (!hasNext()) {
        throw new NoSuchElementException();
      }
      Vector result = type == VectorType.SPARSE ? new RandomAccessSparseVector(numItems) : new DenseVector(numItems);
      result.assign(new UnaryFunction(){
        @Override
        public double apply(double arg1) {
          return random.nextDouble();
        }
      });

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    double docTotal = wordCounts.zSum();
    int docLength = wordCounts.size(); // cardinality of document vectors
    
    // initialize variational approximation to p(z|doc)
    Vector gamma = new DenseVector(state.getNumTopics());
    gamma.assign(state.getTopicSmoothing() + docTotal / state.getNumTopics());
    Vector nextGamma = new DenseVector(state.getNumTopics());
    createPhiMatrix(docLength);
    
    Vector digammaGamma = digammaGamma(gamma);

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    return phi;
  }
  
  private static Vector digamma(Vector v) {
    Vector digammaGamma = new DenseVector(v.size());
    digammaGamma.assign(v, new BinaryFunction() {
      @Override
      public double apply(double unused, double g) {
        return digamma(g);
      }
    });

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  public static List<VectorWritable> getPointsWritable(double[][] raw) {
    List<VectorWritable> points = new ArrayList<VectorWritable>();
    for (double[] fr : raw) {
      Vector vec = new SequentialAccessSparseVector(fr.length);
      vec.assign(fr);
      points.add(new VectorWritable(vec));
    }
    return points;
  }

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  @Test
  public void testCanopyAsFormatStringSparse() {
    double[] d = { 1.1, 0.0, 3.3 };
    Vector m = new SequentialAccessSparseVector(3);
    m.assign(d);
    Cluster cluster = new Canopy(m, 123, measure);
    String formatString = cluster.asFormatString(null);
    System.out.println(formatString);
    assertEquals("format", "C-123{n=0 c=[0:1.100, 2:3.300] r=[]}", formatString);
  }

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  @Test
  public void testCanopyAsFormatStringSparseWithBindings() {
    double[] d = { 1.1, 0.0, 3.3 };
    Vector m = new SequentialAccessSparseVector(3);
    m.assign(d);
    Cluster cluster = new Canopy(m, 123, measure);
    String formatString = cluster.asFormatString(null);
    System.out.println(formatString);
    assertEquals("format", "C-123{n=0 c=[0:1.100, 2:3.300] r=[]}", formatString);
  }

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  @Test
  public void testClusterAsFormatStringSparse() {
    double[] d = { 1.1, 0.0, 3.3 };
    Vector m = new SequentialAccessSparseVector(3);
    m.assign(d);
    Cluster cluster = new org.apache.mahout.clustering.kmeans.Cluster(m, 123, measure);
    String formatString = cluster.asFormatString(null);
    System.out.println(formatString);
    assertEquals("format", "CL-123{n=0 c=[0:1.100, 2:3.300] r=[]}", formatString);
  }

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  @Test
  public void testClusterAsFormatStringSparseWithBindings() {
    double[] d = { 1.1, 0.0, 3.3 };
    Vector m = new SequentialAccessSparseVector(3);
    m.assign(d);
    Cluster cluster = new org.apache.mahout.clustering.kmeans.Cluster(m, 123, measure);
    String formatString = cluster.asFormatString(null);
    System.out.println(formatString);
    assertEquals("format", "CL-123{n=0 c=[0:1.100, 2:3.300] r=[]}", formatString);
  }

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  @Test
  public void testMSCanopyAsFormatStringSparse() {
    double[] d = { 1.1, 0.0, 3.3 };
    Vector m = new SequentialAccessSparseVector(3);
    m.assign(d);
    Cluster cluster = new MeanShiftCanopy(m, 123, measure);
    String formatString = cluster.asFormatString(null);
    System.out.println(formatString);
    assertEquals("format", "MSC-123{n=0 c=[0:1.100, 2:3.300] r=[]}", formatString);
  }

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  @Test
  public void testMSCanopyAsFormatStringSparseWithBindings() {
    double[] d = { 1.1, 0.0, 3.3 };
    Vector m = new SequentialAccessSparseVector(3);
    m.assign(d);
    Cluster cluster = new MeanShiftCanopy(m, 123, measure);
    String[] bindings = { "fee", null, "foo" };
    String formatString = cluster.asFormatString(bindings);
    System.out.println(formatString);
    assertEquals("format", "MSC-123{n=0 c=[fee:1.100, foo:3.300] r=[]}", formatString);

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