Hi,
You can also try this:
set.seed(1)
dat1<-data.frame(id=rep(c(1,2,3),c(30,20,25)),value=rnorm(75,15))
dat2<-data.frame(stack(lapply(split(dat1,dat1$id),FUN=function(x)
1:nrow(x))),value=dat1[,2])
colnames(dat2)[1:2]<-c("seq1","id")
dat2$seq1
# [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
#[26] 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
#[51] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
A.K.
----- Original Message -----
From: bibek sharma <mbhpat...@gmail.com>
To: r-help@r-project.org
Cc:
Sent: Tuesday, October 9, 2012 2:54 PM
Subject: [R] Qustion about Creating a sequence of vector
Hello R User,
I have a data set where subject( Id) are frequently measured. For
example, the size of the data set is 75 by 2 and has following
frequency distribution.
id freq
1 30
2 20
3 25
I want to create a variable (say seq) containing sequential count for
each id. I mean variable seq should be as ( 1,2,..,30, 1,2,...,20,
1,2,...,25)
I use following code but did not work. Any suggestion is much appreciated..
sim<-rep(NA, 90)
for (i in 1:3){
d[i]<-seq(1,a[i,2],by=1)
sim[i]<-as.vector(c(d[i])
}
Thank you,
Bibek
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______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
