savicky at cs.cas.cz
Wed Mar 14 16:14:48 CET 2012
On Wed, Mar 14, 2012 at 07:46:40AM -0700, Alaios wrote:
> Dear all I am having a vector with large length and I would like to ask you if I can aggregate the values by constant sized windows. For example for the following vector, I would like to take 30 points until the end
> and find their mean.
> > myData<-seq(1:100000)
> > c(mean(myData[1:30]),mean(myData[31:60])) #...and so one until the end
>  15.5 45.5
Try the following.
myData <- 1:100
gr <- ceiling((1:length(myData))/30)
c(tapply(myData, gr, FUN=mean))
1 2 3 4
15.5 45.5 75.5 95.5
Hope this helps.
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