Extracting the first element of a list
Ross Darnell <r.darnell at shrs.uq.edu.au> writes:
Perhaps some kind person might show me the way to extract the first element of a list.
The example is
tmp <- c("A", "B C","BC D")
I want the first "word" from each of these elements, i.e. "A" ,"B" ,"BC"
strsplit(tmp," ") returns
[[1]]
[1] "A"
[[2]]
[1] "B" "C"
[[3]]
[1] "BC" "D"
I have had no success in trying to extract the first element.
Of course there may be another way to get the same result.
How about
sapply(strsplit(tmp, " "), "[", 1)
[1] "A" "B" "BC"
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._