[R] Summarizing data based on Date

[Shivi82]

Hi Petr 

I researched a lot over the net and R manual as well based on which I
revamped my code and came to the code as:
test$CR_DT <- as.Date(test$CR_DT, '%d-%b-%y')

iii<- aggregate(test$CHG_WT,list(format(test$CR_DT,"%m")),FUN=sum)

However it still gives me the error as below:
Error in Summary.factor(c(1L, 1L, 1L, 3286L, 1646L, 3241L, 1L, 1L, 1307L,  : 
  ‘sum’ not meaningful for factors. 

If could you guide on how to achieve the desired output. Thanks. 



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