[R] aggregate

[Petr PIKAL]

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
> 
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