On Nov 8, 2013, at 10:56 AM, Hermann Norpois wrote: > Hello, > > having a data frame like test with pairs of characters I would like to > create chains. For instance from the pairs A/B and B/I you get the vector A > B I. It is like jumping from one pair to the next related pair. So for my > example test you should get: > A B F G H I > C F I K > D L M N O P
> second <- with(test, tapply(V2, V1, FUN=function(x) test[test$V2==x, ] ) ) Warning messages: 1: In test$V2 == x : longer object length is not a multiple of shorter object length 2: In test$V2 == x : longer object length is not a multiple of shorter object length 3: In test$V2 == x : longer object length is not a multiple of shorter object length > third <- sapply(names(second) , function(df) c(df, second[[df]][ , "V2" ]) ) > third $A [1] "A" "B" "F" "G" "H" $B [1] "B" "F" "I" "F" "I" $C [1] "C" "F" "I" "K" $D [1] "D" "L" "M" "N" $L [1] "L" "O" "P" > fourth <- sapply(names(third), function(d) unique( c(third[[d]], unlist(third[ sapply( third[[d]], "[" ) ]) ) ) ) > fourth $A [1] "A" "B" "F" "G" "H" "I" $B [1] "B" "F" "I" $C [1] "C" "F" "I" "K" $D [1] "D" "L" "M" "N" "O" "P" $L [1] "L" "O" "P" > > >> test > V1 V2 > 1 A B > 2 A F > 3 A G > 4 A H > 5 B F > 6 B I > 7 C F > 8 C I > 9 C K > 10 D L > 11 D M > 12 D N > 13 L O > 14 L P > > Thanks > Hermann > >> dput (test) > structure(list(V1 = c("A", "A", "A", "A", "B", "B", "C", "C", > "C", "D", "D", "D", "L", "L"), V2 = c("B", "F", "G", "H", "F", > "I", "F", "I", "K", "L", "M", "N", "O", "P")), .Names = c("V1", > "V2"), row.names = c(NA, -14L), class = "data.frame") >> > > [[alternative HTML version deleted]] > > ______________________________________________ > 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 Alameda, CA, USA ______________________________________________ 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.