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

org.apache.mahout.math.matrix.DoubleMatrix2D.viewDice()

Constructs and returns a new dice (transposition) view; Swaps axes; example: 3 x 4 matrix --> 4 x 3 matrix. The view has both dimensions exchanged; what used to be columns become rows, what used to be rows become columns. In other words: view.get(row,column)==this.get(column,row). This is a zero-copy transposition, taking O(1), i.e. constant time. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa. Use idioms like result = viewDice(A).copy() to generate an independent transposed matrix.

Example:

2 x 3 matrix:
1, 2, 3
4, 5, 6

transpose ==>

3 x 2 matrix:
1, 4
2, 5
3, 6

transpose ==>

2 x 3 matrix:
1, 2, 3
4, 5, 6

@return a new dice view.

            }


            final DoubleMatrix2D phraseMatrix = TermDocumentMatrixBuilder
                .buildAlignedMatrix(context, phraseFeatureIndices, termWeighting);
            MatrixUtils.normalizeColumnL2(phraseMatrix, null);
            context.termPhraseMatrix = phraseMatrix.viewDice();
        }
    }


    /**
     * Calculates the boost we should apply to a stem, based on the field indices array.

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