[R-Forge #5204] Fail to add new column within functions when column quota is reached #496

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1. jangorecki commented on Apr 5, 2020

   

   jangorecki

   on Apr 5, 2020

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   reproducible example

   d = data.table()
   f = function(d, n) {
     for (i in 1:n) d[, paste0("V",i) := i]
   }
   getOption("datatable.alloccol")
   #[1] 1024
   f(d, 1200)
   ncol(d)
   #[1] 1024 ## should be 1200!
2. ben-schwen commented on May 9, 2021

   

   ben-schwen

   on May 9, 2021

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   Its also inconsistent with set

   d = data.table()
   f2 = function(d, n) {
     for (i in 1:n) set(d, j = paste0("V",i), value = i)
   }
   f2(d, 1200)
   
   Error in set(d, j = paste0("V", i), value = i) : 
     Internal error: DT passed to assign has not been allocated enough column slots. l=1024, tl=1024, adding 1
3. ben-schwen commented on Oct 4, 2021

   

   ben-schwen

   on Oct 4, 2021

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   This seems also similar to #1633
4. MichaelChirico commented on Jul 5, 2025

   

   MichaelChirico

   on Jul 5, 2025

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   I think it's definitely a dup of #1633, I added the set() example there and also one that doesn't use for.
5. MichaelChirico

   closed this as completedon Jul 5, 2025
6. MichaelChirico

   added

   duplicate

   on Jul 5, 2025