Reply To: How can I apply a func to a grouped table?

[Cecilia]

I ran into another problem. It seems some AskOrder of the stock has less than 16 data, so it says

‘length

[1] f:{(`$x,/:string 1+til y)!az -1+(where deltas y xrank az:asc z),count z}

What should I do?

I’ve tried to filter out those stock using:

select from t where count each AskOrder > 16 by stock

However, it says

 'stock
  [3]  select from t where count each AskOrder > 16 by stock

My t is like this:

q)t
stock AskOrder BidOrder
-----------------------
p     1        39      
e     76       97      
k     65       74  

I’ve also tried to use length:

l: select length: count each AskOrder by stock from t;
l: () xkey lengths;
select stock from l where length > 16;

But it says:

'type
  [3]  select stock from l where length > 16;