selectionView(rowIndices, columnIndices) {
                return new MLMatrixSelectionView(this, rowIndices, columnIndices);
            }
Returns a view of the cross of the row indices and the column indices
@example
// resulting vector is [[2], [2]]
var matrix = new Matrix([[1,2,3], [4,5,6]]).selectionView([0, 0], [1])
@param {Array<number>} rowIndices
@param {Array<number>} columnIndices
@return {MatrixSelectionView}