Pat Meyer <paterijk <at> hotmail.com> writes: : : Hi, : : First of all, let me thank you all for replying so rapidly to my first : question on this list. It was very very helpfull... and I'm learning R : faster and faster. : : I just encountered a second problem, which may also have a simple solution. : : Here it is: : : In my program, a vector is a set of objects. : : I was looking for a way to store these sets in a big object. I chose to : store them in a list. : : So now I have a list of vectors which looks as follows: : : [[1]] : [1] "a1" "a3" "a4" : : [[2]] : [1] "a1" "a4" "a5" : : [[3]] : [1] "a1" "a5" "a6" : : Then comes a crucial step where I may have to add the vector ("a3", "a1", : "a4") in this list. : : But as you can see, this set is already present (at position 1 of my list). : So it should not be added. If I do a systematic concatenation, at the end, I : have a list with too many vectors (where some elements of my list represent : the same set). : : So what I would like to do is a type of Union, but I can't find a way to do : it. Unions work only on vectors, and not a vector and a list of vectors.
L <- list(c("a1","a3","a4"), c("a1","a4","a5"), c("a1","a5","a6")) newentry <- c("a3", "a1", "a4") if (!any(sapply(L, setequal, newentry))) L <- c(L, list(newentry)) ______________________________________________ [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