if statement - First and Last in SAS and R -


I am working on converting a SAS code to R, but I have to do IF first to replicate Used to be. & Amp; Final In the command. SAS command is - 

  Data A; Set B; From the comp ID, date; If first date; Run;   
 My understanding is that only the first date for CompID, ID and date combination is selected and the data is output A. Am i right  
 I know about the  duplicate  command in the RR, but if I use the following code -  
  A & lt; - B [! Duplicated (B $ date),]   
 I get less overview than my SAS output. Am I missing something here?  
 Thank you in advance.  
  
 
 
 R can also be created in a  duplicated data frame  function): < / P> 
  a & lt; - B [! To duplicate (duplicate) (BC, 'compedit', 'id', 'date')]],]   
. For previous action, look for the help page for duplicates and see me Looks like you'll find a type of  from  , but I always need to check its spelling.  
 Build: "I get fewer comments than this. .. "I feel wrong, but I do not travel in all English speaking countries The Minister. At least in the US, I think that "little" or "a small number" will read a little easier.

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