Doug -
Try
d$avg = apply(d,1,mean,na.rm=TRUE)
d
st1 st2 st3 st4 avg
1 1 2 5 6 3.500000
2 2 5 5 5 4.250000
3 3 6 NA 7 5.333333
4 4 7 7 8 6.500000
(If you must use a loop, calculate
mean(as.numeric(d[i,1:4]))
Take a look at mean(d[1,1:4]) to see why your
program doesn't work properly.)
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Mon, 28 Jun 2010, Douglas M. Hultstrand wrote:
Hello,
I am trying to calculate the mean value of each row in a data frame (d), I am
having troubles and getting errors using the code I have written. Below is a
brief example of the code, any thought or suggestions would be great.
Thank you for your time,
Doug
# Example Code:
d <- data.frame(st1=c(1,2,3,4), st2=c(2,5,6,7), st3=c(5,5,NA,7),
st4=c(6,5,7,8))
avg <- rep(NA,length(d[,1]))
for (i in 1:length(d[,1])) {
avg[i] = mean(d[i,1:4], na.rm=TRUE)
}
# Final Output wanted.
st1 st2 st3 st4 avg
1 1 2 5 6 3.50
2 2 5 5 5 4.25
3 3 6 NA 7 5.33
4 4 7 7 8 6.50
--
---------------------------------
Douglas M. Hultstrand, MS
Senior Hydrometeorologist
Metstat, Inc. Windsor, Colorado
voice: 720.771.5840
email: dmhul...@metstat.com
web: http://www.metstat.com
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
