可以用update 和rowNo函数

t2 = table(take(`A,10) join take(`B,10) as sym, take(09:56:00+1..10,20) as time, (10+(1..10)\10-0.05) join (20+(1..10)\10-0.05) as bid, (10+(1..10)\10+0.05) join (20+(1..10)\10+0.05) as offer, take(100 300 800 200 600, 20) as volume);
update t2 set bid=bid*( rowNo(bid)>=3) +5*(rowNo(bid)<=3) context by sym
update t2 set bid=bid*( rowNo(bid)<size(bid)-3) +5*(rowNo(bid)>=size(bid)-3) context by sym