Dear Dimitris, dear Matthias,
thank you very much, I adapted the short solution you both provided -
works as intended. And I have learned sth. once again.
Regards,
Stefan
Dimitris Rizopoulos schrieb:
try this:
q1 <- c(4660,5621,5629,8030,8080,8180,8501,8190,8370,8200)
dat <- read.table(textConnection(
"number height
1 4660 2.5
2 5010 1.4
3 5621 0.8
4 5629 2.3
5 8030 2.5
6 8080 2.4
7 8090 0.9
8 8180 1.4
9 8501 1.2
10 8190 1.9
11 8200 2.0
12 8370 2.1
13 8200 1.8"), header = TRUE)
closeAllConnections()
mean(with(dat, height[number %in% q1]))
# or
mean(dat$height[dat$number %in% q1])
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- Original Message ----- From: "Stefan Uhmann"
<[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, May 15, 2008 10:07 AM
Subject: [R] Function for subset of cases/lines
Hi,
I have a vector:
q1<-c(4660,5621,5629,8030,8080,8180,8501,8190,8370,8200)
The following command gives me the mean of its elements:
mean(q1)
[1] 7346.1
What can I do to do the same for the variable 'height', but only for
the cases/rows which have one of the elements of q1 as 'number':
number height
1 4660 2.5
2 5010 1.4
3 5621 0.8
4 5629 2.3
5 8030 2.5
6 8080 2.4
7 8090 0.9
8 8180 1.4
9 8501 1.2
10 8190 1.9
11 8200 2.0
12 8370 2.1
13 8200 1.8
Thanks for any help,
Stefan
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and provide commented, minimal, self-contained, reproducible code.
