Examples of org.apache.mahout.math.matrix.DoubleMatrix2D.viewRow()

Class org.apache.mahout.math.matrix.DoubleMatrix2D

Examples of org.apache.mahout.math.matrix.DoubleMatrix2D.viewRow()

org.apache.mahout.math.matrix.DoubleMatrix2D.viewRow()
Constructs and returns a new slice view representing the columns of the given row. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa. To obtain a slice view on subranges, construct a sub-ranging view (viewPart(...)), then apply this method to the sub-range view.
Example:

2 x 3 matrix:
1, 2, 3
4, 5, 6 viewRow(0) ==> Matrix1D of size 3:
1, 2, 3

@param row the row to fix. @return a new slice view. @throws IndexOutOfBoundsException if row < 0 || row>= rows(). @see #viewColumn(int)

   *
   * @param matrix the matrix to convert.
   */
  public String toString(DoubleMatrix1D matrix) {
    DoubleMatrix2D easy = matrix.like2D(1, matrix.size());
    easy.viewRow(0).assign(matrix);
    return toString(easy);
  }


  /**
   * Returns a string representation of the given matrix.

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    for (int r = rowIndexes.length; --r >= 0;) {
      int row = rowIndexes[r];
      if (row < 0 || row >= rows) {
        throw new IndexOutOfBoundsException("Illegal Index");
      }
      sub.viewRow(r).assign(A.viewRow(row));
    }
    return sub;
  }


  /**

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    //int nx = B.columns();


    // precompute and cache some views to avoid regenerating them time and again
    DoubleMatrix1D[] Xrows = new DoubleMatrix1D[n];
    for (int k = 0; k < n; k++) {
      Xrows[k] = X.viewRow(k);
    }


    // Solve L*Y = B;
    for (int k = 0; k < n; k++) {
      for (int i = k + 1; i < n; i++) {

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        DoubleMatrix2D VT = V.viewDice();
        aggregates = new double [VT.rows()];


        for (int i = 0; i < aggregates.length; i++)
        {
            aggregates[i] = VT.viewRow(i).aggregate(Functions.PLUS, Functions.SQUARE);
        }


        final IndirectComparator.DescendingDoubleComparator comparator = new IndirectComparator.DescendingDoubleComparator(
            aggregates);
        V = MatrixUtils.sortedRowsView(VT, comparator).viewDice();

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