How to apply multiple function to data.table in R -


I tried to: 

  dt < - data.table (MonthName = month name, id = 1: 3, a = stomach (rnorm (12)), b = abs (rnorm (12)), c = abs (rnorm (12)), d = abs (Rnorm (12)) Satki (DT, ID) ANS & lt; - DT [, Lapli (SD, Earth) / Lapple (SD, SD), = 'ID'. SDCOL = Name (DT) [- 1]]   
 But does this error, so there are ways to do this? Thank you   
 
 
 Use  lapply  in other codes in the same context:  
  ANS & lt; - DP [, lapali (SD), function (x) meaning (x) / sd (x)), = 'id'. SDCL = Name (DT) [- 1]]

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