On Sep 8, 2014, at 12:08 PM, eliza botto wrote:
> Dear R members,
>
> I have this data frame of 100 years in the following format
>
> year month day A B C D
>
> where A,B,C and D are item number sold each day. I am trying
>
> 1-split the data w.r.t the monthly values for each year
>
> 2-then, sum them up
>
> I am pasting here just a part of data to make it more clearer
>
> structure(list(year = c(1961, 1961, 1961, 1961, 1961, 1961, 1961,
> 1961, 1961, 1961, 1961, 1961), month = c(1, 1, 1, 1, 1, 1, 1,
> 1, 1, 1, 1, 1), day = 1:12, A = 1:12, B = 3:14, C = 6:17, D = 16:27), .Names
> = c("year",
> "month", "day", "A", "B", "C", "D"), row.names = c(NA, 12L), class =
> "data.frame")
>
> I initially tried to use "dcast" command but for no use.
>
This is typical use for base function aggregate:
> with( dfrm, aggregate(dfrm[4:7], dfrm[1:2], FUN=sum))
year month A B C D
1 1961 1 78 102 138 258
>
> [[alternative HTML version deleted]]
Please stop posting in plain text. (You have already been asked multiple times.)
--
David Winsemius
Alameda, CA, USA
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