Dear Stefan,
what about
q1<-c(4660,5621,5629,8030,8080,8180,8501,8190,8370,8200)
x <- data.frame(number = c(4660, 5010, 5621, 5629, 8030, 8080 , 8090,
8180, 8501, 8190, 8200, 8370, 8200), height = c(2.5, 1.4, 0.8, 2.3, 2.5,
2.4, 0.9, 1.4, 1.2, 1.9, 2.0, 2.1, 1.8))
ind <- x[,"number"] %in% q1
mean(x[ind,"height"])
## or shorter
mean(x[x[,"number"] %in% q1,"height"])
Best,
Matthias
Stefan Uhmann wrote:
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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Dr. Matthias Kohl
www.stamats.de
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
