[R] Summarizing data based on Date

[David L Carlson]

What does the following command print out?

str(test)

The error message indicates that test$CHG_WT is not numeric.

-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Shivi82
Sent: Tuesday, June 9, 2015 7:01 AM
To: r-help at r-project.org
Subject: Re: [R] Summarizing data based on Date

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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