X <- as.logical(rep(c(0,1), each=13)) names(X) <- LETTERS
which(X) N O P Q R S T U V W X Y Z 14 15 16 17 18 19 20 21 22 23 24 25 26 names(which(X)) [1] "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X" "Y" "Z" ?which David Hajage wrote: > Hello, > > My problem is quite simply, but I didn't find any solution... > > I have a vector : > >> truc > longueur30 longueur40 longueur50 longueur60 longueur70 longueur80 > longueur90 > 34 FALSE FALSE FALSE FALSE TRUE FALSE > FALSE > > I would like to have the name of the column where there is "TRUE". > >> colnames(truc) > [1] "longueur30" "longueur40" "longueur50" "longueur60" "longueur70" > [6] "longueur80" "longueur90" > >> truc[truc == T] > [1] TRUE > >> colnames(truc[truc == T]) > NULL > > How can I do it ? > > Thank you for your help. > -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
