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2016 Apr 02
0
apply mean function to a subset of data
Hi Pedro,
This may not be much of an improvement, but it was a challenge.
selvec<-as.vector(matrix(c(nsel,unlist(by(toy$diam,toy$group,length))-nsel),
ncol=2,byrow=TRUE))
TFvec<-rep(c(TRUE,FALSE),length.out=length(selvec))
toynsel<-rep(TFvec,selvec)
by(toy[toynsel,]$diam,toy[toynsel,]$group,mean)
Jim
On 4/3/16, Pedro Mardones <mardones.p at gmail.com> wrote:
> Dear all;
>
> This must have a rather simple answer but haven't been able to figure it...
2016 Apr 03
1
apply mean function to a subset of data
...l.com>
Cc: r-help mailing list <r-help at r-project.org>
Subject: Re: [R] apply mean function to a subset of data
Hi Pedro,
This may not be much of an improvement, but it was a challenge.
selvec<-as.vector(matrix(c(nsel,unlist(by(toy$diam,toy$group,length))-nsel),
ncol=2,byrow=TRUE))
TFvec<-rep(c(TRUE,FALSE),length.out=length(selvec))
toynsel<-rep(TFvec,selvec)
by(toy[toynsel,]$diam,toy[toynsel,]$group,mean)
Jim
On 4/3/16, Pedro Mardones <mardones.p at gmail.com> wrote:
> Dear all;
>
> This must have a rather simple answer but haven't been able to figure it...
2016 Apr 02
3
apply mean function to a subset of data
Dear all;
This must have a rather simple answer but haven't been able to figure it
out: I have a data frame with say 2 groups (group 1 & 2). I want to select
from group 1 say "n" rows and calculate the mean; then select "m" rows from
group 2 and calculate the mean as well. So far I've been using a for loop
for doing it but when it comes to a large data set is