Yes, thanks for this, this is exactly what I want to do. However, I have a remaining problem which is how to get R to understand that each entry in my matrix is a vector of names.
I have been trying to import my text file with the names in each vector of names enclosed in quotes and separated by commas, or separated by spaces, or without quotes, etc, with no luck. Everytime, R seems to consider the vector of names as just one long name. In my first colum, for example, I have "henry", in the second, "mary", "ruth", and in the third "mary", "joseph", and I have no idea how to get R to see that "mary", "ruth", for example, is composed of two strings of text, rather than just one. Thanks for any further help! http://old.nabble.com/file/p26305756/ffoexample.txt ffoexample.txt Tony Plate wrote: > > Nice problem! > > If I understand you correctly, here's how to do it (with list-based > matrices): > >> set.seed(1) >> (x <- matrix(lapply(rpois(10,2)+1, function(k) sample(letters[1:10], >> size=k)), ncol=2, dimnames=list(1:5,c("A","B")))) > A B > 1 Character,2 Character,5 > 2 Character,2 Character,5 > 3 Character,3 Character,3 > 4 Character,5 Character,3 > 5 Character,2 "i" >> x[1,1] > [[1]] > [1] "c" "b" > >> x[1,2] > [[1]] > [1] "c" "d" "a" "j" "f" > >> (y <- cbind(x, "A-B"=apply(x, 1, function(ab) setdiff(ab[[1]], >> ab[[2]])))) > A B A-B > 1 Character,2 Character,5 "b" > 2 Character,2 Character,5 "g" > 3 Character,3 Character,3 Character,3 > 4 Character,5 Character,3 Character,2 > 5 Character,2 "i" Character,2 >> y[1,3] > [[1]] > [1] "b" > >> > > -- Tony Plate > > esterhazy wrote: >> Hi, >> >> I have a matrix with two columns, and the elements of the matrix are >> vectors. >> >> So for example, in line 3 of column 1 I have a vector v31=("marc", >> "robert, >> "marie"). >> >> What I need to do is to compare all vectors in column 1 and 2, so as to >> get, >> for example setdiff(v31,v32) into a new column. >> >> Is there a way to do this in R? >> >> Thanks! > > ______________________________________________ > 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. > > -- View this message in context: http://old.nabble.com/Comparison-of-vectors-in-a-matrix-tp26284855p26305756.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
