On Nov 25, 2011, at 2:10 PM, Ian Strang wrote:
This look really interesting but I don't understand what is happening.
Please can someone explain the last line and what the bit in [] is
doing.
Ian
You just stick the new line on the bottom and return the rows in the
order specified in the "i" argument to "[". It's just like vector
indexing except with rows.
> (1:4)[c(4,2,3,1)]
[1] 4 2 3 1
> (4:1)[c(4,2,3,1)]
[1] 1 3 2 4
>
df = data.frame( A=c('a','b','c'), B=c(1,2,3), C=c(10,20,30),
stringsAsFactors=FALSE)
newrow = c('X', 100, 200)
rbind(df,newrow)[c(1,4,2,3),]
______________________________________________
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.
David Winsemius, MD
West Hartford, CT
______________________________________________
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.
