Did you try:
z[f]
On 25/11/2011 19:23, Jack Tanner wrote:
I have a named vector:
z<- c(1, 2, 3, 2)
names(z)<- c("a","b","c","b")
f<- c("b","c")
I want to know the index in z of the first occurrence of each of the values in
f.
One implementation is
sapply(f, function(x) which(names(z)==x)[1])
b c
2 3
Is which() smart enough to stop when it finds in z the first occurrence of every
value from f, or does it search through all the values in z only to report the
first one?
Are some more elegant ways of writing this code?
Just curious.
______________________________________________
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.
--
Patrick Burns
pbu...@pburns.seanet.com
twitter: @portfolioprobe
http://www.portfolioprobe.com/blog
http://www.burns-stat.com
(home of 'Some hints for the R beginner'
and 'The R Inferno')
______________________________________________
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.
