aggregate

An embedded and charset-unspecified text was scrubbed...
Name: not available
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120314/5f0b273a/attachment.pl>
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
[1] 15.5 45.5
Hi.

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.

Petr Savicky.
Hi
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
[1] 15.5 45.5

I have searched in the R documentation and I found the aggregate but it 
seems to operate on data.frames. It also has this by argument where I 
Why do you think so? Aggregate works on any suitable object, e.g. vector.
tried to set it to 30 but it expects there a list rather than a numeric 
value.
From help page
by
a list of grouping elements, each as long as the variables in x.

the only thing what aggregate wants is

list(some.vector.with.the.same.length.as.variable.you.want.to.aggregate)

as some categorical data according to what you want to perform the 
function operation.

Regards
Petr
Could you please help me ?
I would like to thank you in advance for your help

B.R
Alex

   [[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.