Do an str() on the data. It looks like your variable is an integer where you 
probably need a date or a factor.

Would you please include some sample data if possible. See ?dput which is the 
preferred way for sending sample data. It ensures that the reader is looking at 
the exact same data that you have on your machine.  

If the data set is large a small, representative sample is find. Something like 
dput(head(dat1, 100)) is probably fine. Fake data is okay if it is in the same 
format as the real.  Check with str() before sending.

John Kane
Kingston ON Canada


> -----Original Message-----
> From: shivibha...@ymail.com
> Sent: Sat, 22 Aug 2015 00:43:05 -0700 (PDT)
> To: r-help@r-project.org
> Subject: [R] Date as Integer
> 
> Hi All,
> 
> I am using dplyr package and need to find total bills booked grouped on a
> date level however my date is integer.
> In the code below i was trying to change date format from integer.
> However
> it is throwing an error:
> 
> "no applicable method for 'group_by_' applied to an object of class
> "c('integer', 'numeric')"
> 
> ak%>%
>   group_by(as.Date(pickdate),"%y%m%d")%>%
>   summarise(Total=count(waybill))
> 
> Do i need to create a new var first changing the date and then group it
> or
> as.Date will work as i added in dplyr.
> 
> 
> 
> 
> 
> --
> View this message in context:
> http://r.789695.n4.nabble.com/Date-as-Integer-tp4711377.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
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