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  .Q.def[]

  Posted by lestat-jin on April 30, 2024 at 6:17 pm

  trying to provide default parameters with the below statement:

  d:.Q.def[`num1!5].Q.opt .z.x;</i><br></p><p><br></p><p>error as follows:</p><p><br></p><pre>evaluation error:

  type

  [1] (.Q.def)

  [0] d:.Q.def[`num1!5].Q.opt .z.x;
  ^

  does .Q.def only takes in list or atoms such as the above is fine? Thanks.

  lestat-jin replied 6 months, 2 weeks ago 2 Members · 3 Replies
• 3 Replies

• 

  rocuinneagain

  Member

  April 30, 2024 at 7:03 pm

  Dictionaries require lists to be passed to either side of !. You can use enlist to make lists from atoms:

  • https://code.kx.com/q/ref/enlist/
  • https://code.kx.com/q/basics/dictsandtables/#construction

  q)d:.Q.def[enlist[`num1]!enlist 5].Q.opt .z.x
  q)d
  num1| 5

  If you are using kdb 4.1 you can use the new dictionary syntax which does not need enlist

  • https://code.kx.com/q//releases/ChangesIn4.1/#dictionary-literal-syntax

  q)d:.Q.def[([num1:5])].Q.opt .z.x
  q)d
  num1| 5

  • 

    lestat-jin

    Member

    May 7, 2024 at 11:29 am

    thanks!

• 

  lestat-jin

  Member

  May 7, 2024 at 11:28 am

  thanks.

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