I don't think there's that sort of "apply-reduce" function in R, but for this problem, the last line below happens to be a "one-liner":
> set.seed(1) > x <- lapply(1:10, function(i) sample(letters, 20)) > table(unlist(x)) a b c d e f g h i j k l m n o p q r s t u v w x y z 6 8 7 8 9 9 10 9 8 10 6 7 9 7 6 8 8 6 9 6 9 6 9 7 6 7 > which(table(unlist(x))==10) g j 7 10 > names(which(table(unlist(x))==10)) [1] "g" "j" > Weiwei Shi wrote: > assume t2 is a list of size 11 and each element is a vector of characters. > > the following codes can get what I wanted but I assume there might be > a one-line code for that: > > t3 <- t2[[1]] > for ( i in 2:11){ > t3 <- intersect(t2[[i]], t3) > } > > or there is no such "apply"? > > On 4/24/07, Weiwei Shi <[EMAIL PROTECTED]> wrote: >> Hi, >> I searched the archives and did not find a good solution to that. >> >> assume I have 10 sets and I want to have the common character elements of >> them. >> >> how could i do that? >> >> -- >> Weiwei Shi, Ph.D >> Research Scientist >> GeneGO, Inc. >> >> "Did you always know?" >> "No, I did not. But I believed..." >> ---Matrix III >> > > ______________________________________________ R-help@stat.math.ethz.ch 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.