maxRow(row) {
                util.checkRowIndex(this, row);
                var v = this.get(row, 0);
                for (var i = 1; i < this.columns; i++) {
                    if (this.get(row, i) > v) {
                        v = this.get(row, i);
                    }
                }
                return v;
            }
Returns the maximum value of one row
@param {number} row - Row index
@return {number}