[R] averaging pairs of columns in a dataframe

[JonD]

That's great, thanks!

Jon



Gabor Grothendieck wrote:
> 
> Try this:
> 
> # test data
> DF <- data.frame(a = 1:9, a = 21:29, b = 31:39, b = 41:49, check.names =
> FALSE)
> 
> t(apply(DF, 1, tapply, names(DF), mean))
> 
> It gives a matrix so use as.data.frame on that if you need a data frame
> 
> 
> 

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