• kdb+

  How to write local function which can be called from different levels

  Posted by vivo on July 29, 2022 at 12:00 am

  Hi,

  My code below works without error:

  No Error

  g:`;
  g:{[xG] xG + 2}; // global; works for f and h
  f:{[xF] 
  h:{[xH] g[xH] + 3};
  show g[xF] + h[xF];
  }
  f[40]; // i.e. 87; no error

   

  However, I prefer a local g instead of a local one. I also tried below, but both failed:

  Trial 1 (Failed)

  g:`;
  f:{[xF] 
  g:{[xG] xG + 2}; // local; doesn't work for h
  h:{[xH] g[xH] + 3};
  show g[xF] + h[xF];
  }
  f[40]; // error

  and

  Trial 2 (Failed)

  g:`;
  f:{[xF] 
  h:{[xH] g:{[xG] xG + 2}; g[xH] + 3}; // local; doesn't work for f
  show g[xF] + h[xF];
  }
  f[40];// error

  Is it possible to have a local g without an error? Thanks.

  vivo replied 8 months, 1 week ago 2 Members · 1 Reply
• 1 Reply

• 

  rocuinneagain

  Member

  July 29, 2022 at 12:00 am

  You could pass it in to a projection

   

  q)f:{[xF] g:{[xG] xG + 2};
         h:{[g;xH] g[xH] + 3}[g];
         g[xF] + h[xF]} 
  
  q)f[40] 
  87

   

  Or composition in this basic case

   

  q)f:{[xF] g:{[xG] xG + 2};
          h:+[3] g @;
          g[xF] + h[xF]} 
  
  q)f[40] 
  87

   

   

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