text: public ValueEval GetAbsoluteValue(int row, int col){int rowOffsetIx = row - _firstRow;int colOffsetIx = col - _firstColumn;if (rowOffsetIx < 0 || rowOffsetIx >= _nRows){throw new ArgumentException("Specified row index (" + row+ ") is outside the allowed range (" + _firstRow + ".." + _lastRow + ")");}if (colOffsetIx < 0 || colOffsetIx >= _nColumns){throw new ArgumentException("Specified column index (" + col+ ") is outside the allowed range (" + _firstColumn + ".." + col + ")");}return GetRelativeValue(rowOffsetIx, colOffsetIx);}