public double[] getRow(int row) {
        double[] arr = new double[columns];
        for (int i = 0; i < columnToReal.length; ++i)
            arr[i] = backingMatrix.get(row, columnToReal[i]);
        return arr;
    }
public double [ ] getRow ( int row ) { double [ ] arr = new double [ columns ] ; for ( int i = 0 ; i < columnToReal . length ; ++ i ) arr [ i ] = backingMatrix . get ( row , columnToReal [ i ] ) ; return arr ; }
{@inheritDoc}