Package cc.mallet.types

Examples of cc.mallet.types.Matrixn.singleToIndices()

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  public void testIndexing1d ()
  {
    double m1[] = new double[]{1.0, 2.0, 3.0, 4.0};
    int idx1[] = new int[1];
    Matrixn a = new Matrixn (m1);
    a.singleToIndices (3, idx1);
    assertEquals (3, idx1[0]);
    assertEquals (3, a.singleIndex (idx1));
  }

  public void testIndexing2d ()
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    for (int i = 0; i < 6; i++) {
      m1[i] = 2.0 * i;
    }
    Matrixn a = new Matrixn (sizes, m1);
    int[] idx1 = new int[2];
    a.singleToIndices (5, idx1);
    System.out.println (idx1[0]+" , "+idx1[1]);

    int[] trueIdx = new int[] {1, 2};
    assertTrue (Arrays.equals (trueIdx, idx1));
    assertEquals (5, a.singleIndex (idx1));
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  public void testIndexing3d ()
  {
    Matrixn a = make3dMatrix ();
    int[] idx1 = new int[3];
    a.singleToIndices (21, idx1);

    int[] trueIdx = new int[]{1, 2, 1};
    assertTrue (Arrays.equals (trueIdx, idx1));
    assertEquals (21, a.singleIndex (idx1));
    assertEquals (42.0, a.value (idx1), 1e-12);
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    for (int i = 0; i < a.singleSize (); i++) {
      int[] idxa = new int [a.getNumDimensions ()];
      int[] idxb = new int [a.getNumDimensions ()];

      a.singleToIndices (i, idxa);
      b.singleToIndices (i, idxb);

      assertTrue (Arrays.equals (idxa, idxb));
      assertEquals (a.value (idxa), b.value (idxb), 1e-12);
    }
  }
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