I tried aggregate, apply etc, but can't get the right result.
For example,
m <- cbind(c(LETTERS[1:5]), c("aa", "bb", "cc",
"aa", "cc")) [,1] [,2][1,] "A"
"aa"[2,] "B" "bb"[3,] "C"
"cc"[4,] "D" "aa"[5,] "E"
"cc"
how to obtain m.new where "aa", "bb", and "cc" are
groups, and more than one values "A" to "E" belonging to the
same group are separated by "|"
[,1] [,2][1,] "aa" "A|D"[2,] "bb"
"B"[3,] "cc" "C|E"
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Daren Tan <daren76 <at> hotmail.com> writes:> I tried aggregate, apply etc, but can't get the right result. > > For example, > > m <- cbind(c(LETTERS[1:5]), c("aa", "bb", "cc", "aa", "cc")) > "cc"[4,] "D" "aa"[5,] "E" "cc" > how to obtain m.new where "aa", "bb", and "cc" are groups,belonging to the> same group are separated by "|" > [,1] [,2][1,] "aa" "A|D"[2,] "bb" "B"[3,] "cc" "C|E" >How about do.call("expand.grid", rep(list(c("u", "l")), 3)) Var1 Var2 Var3 1 u u u 2 l u u 3 u l u 4 l l u 5 u u l 6 l u l 7 u l l 8 l l l -- Ken Knoblauch Inserm U846 Institut Cellule Souche et Cerveau D?partement Neurosciences Int?gratives 18 avenue du Doyen L?pine 69500 Bron France tel: +33 (0)4 72 91 34 77 fax: +33 (0)4 72 91 34 61 portable: +33 (0)6 84 10 64 10 http://www.sbri.fr
Try this: m <- as.data.frame(m) m.new <- sapply(split(m, m$V2), function(x)paste(x$V1, collapse="|")) On Mon, Jun 23, 2008 at 10:10 AM, Daren Tan <daren76@hotmail.com> wrote:> > > I tried aggregate, apply etc, but can't get the right result. > > For example, > > m <- cbind(c(LETTERS[1:5]), c("aa", "bb", "cc", "aa", "cc")) [,1] > [,2][1,] "A" "aa"[2,] "B" "bb"[3,] "C" "cc"[4,] "D" "aa"[5,] "E" "cc" > how to obtain m.new where "aa", "bb", and "cc" are groups, and more than > one values "A" to "E" belonging to the same group are separated by "|" > [,1] [,2][1,] "aa" "A|D"[2,] "bb" "B"[3,] "cc" "C|E" > > > _________________________________________________________________ > Easily edit your photos like a pro with Photo Gallery. > > [[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. >-- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]