• kdb+

  dictionaries as functions

  Posted by kdb_newbie on December 6, 2024 at 4:25 pm

  I have 2 functions defined in the test namespace:
  .test.ex.t1:{[data] xxx; xxx;};
  .test.ex.t2:{[data] xxx; xxx;};

  Then, I want call these functions as below:
  .test.ex .’ ((`t1;data);(`t2;data))
  but I run into a length error – what’s the correct syntax?

  unterrainer_ale replied 2 weeks ago 3 Members · 2 Replies
• 2 Replies

• 

  rocuinneagain

  Member

  December 6, 2024 at 4:43 pm

  /: each-right is what you want https://code.kx.com/q/ref/maps/#each-left-and-each-right 

  q).test.ex.t1:{[data] data};
  q).test.ex.t2:{[data] data};
  q).test.ex ./:((`t1;1);(`t2;1))
  1 1

  • This reply was modified 2 weeks ago by  rocuinneagain.
• 

  unterrainer_ale

  Member

  December 6, 2024 at 4:45 pm

  If you look at your dictionary you can see that your key is a symbol atom, so you have to index by a symbol. Once you have done that, you can pass the value as parameter. This syntax should work

  // Your dictionary
  q).test.ex
    | ::
  t1| {[x] x}
  t2| {[x] x}
  q).test.ex[`t1`t2]@'3 4
  3 4

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