Hi,
On Feb 10, 2010, at 8:58 PM, Tim Clark wrote:
Dear List,
I am trying to find each time a value changes in a dataset. The
numbers are variables for day vs. night values, so what I am really
getting is the daily sunrise and sunset.
A simplified example is the following:
x<-seq(1:100)
y1<-rep(1,10)
y2<-rep(2,10)
y<-c(y1,y2,y1,y1,y1,y2,y1,y2,y1,y2)
xy<-cbind(x,y)
I would like to know each time the numbers change.
Correct answer should be:
x=1,11,21,51,61,71,81,91
I think this gets close...
which(diff(y) != 0)
[1] 10 20 50 60 70 80 90
You'll need to fiddle to get exactly what you want.
Cheers,
Ben
I would appreciate any help or suggestions. It seems like it should
be simple but I’m stuck!
Thanks,
Tim
Tim Clark
Department of Zoology
University of Hawaii
______________________________________________
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.
