[R] Moving column averaging

[B77S]

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.
> 
> -- 
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
> 
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