[R] Moving column averaging
bps0002 at auburn.edu
Fri Dec 2 02:16:44 CET 2011
Sorry for that, and thanks Gabor,
I could have sworn that it wouldn't.
Gabor Grothendieck wrote
> On Thu, Dec 1, 2011 at 7:13 PM, B77S <bps0002@> wrote:
>> # need zoo to use rollapply()
>> # your data (I called df)
>> df <- structure(list(a = 1:2, b = 2:3, c = c(5L, 9L), d = c(9L, 6L),
>> e = c(1L, 5L), f = c(4, 7)), .Names = c("a", "b", "c", "d",
>> "e", "f"), class = "data.frame", row.names = c(NA, -2L))
>> # transpose and make a zoo object
>> df2 <- zoo(t(df))
>> #rollapply to get means and transpose back
>> means <- t(rollapply(df2, width=2, by=2, FUN=mean))
>> # adding the combined column names you requested
>> colnames(means) <- apply(matrix(names(df), nrow=2), 2, paste, collapse=",
> Note that zoo's rollapply also works on plain matrices and vectors.
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> email: ggrothendieck at gmail.com
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> and provide commented, minimal, self-contained, reproducible code.
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