maxColumnIndex(column) {
                util.checkColumnIndex(this, column);
                var v = this.get(0, column);
                var idx = [0, column];
                for (var i = 1; i < this.rows; i++) {
                    if (this.get(i, column) > v) {
                        v = this.get(i, column);
                        idx[0] = i;
                    }
                }
                return idx;
            }
Returns the index of the maximum value of one column
@param {number} column - Column index
@return {Array}