This is very helpful. Thank you very much.
Charles C. Berry wrote: > > On Fri, 20 Nov 2009, newbyr wrote: > >> >> Hi, >> >> I'm looking for a function that will take a list of columns or data.frame >> and corvert it to cartesian pairlist. For example for this data.frame >> (see >> below), I'd like to get a list of all possible pairs: >> >>> sound >> cs rs ns >> 7 5 2 >> 4 5 4 >> 6 3 1 >> 8 4 1 >> 6 4 2 >> 6 7 1 >> 2 2 5 >> 9 2 5 >> > >> how can I get this? >>> mylist >> ((cs,rs), (cs,ns), (rs,ns)) > > str(combn(colnames(df),2,function(x) df[,x],simplify=F)) > > see > > ?combn > > HTH, > > Chuck > > p.s. Following the posting guide's hints you might try > > ?combinations # no go, but it says try ??combinations > ??combinations # shows utils:combn > ?combn # bingo! > > > > >> >> This list contains a set of all possible combinations of column pairs. >> >> Thank you for your help. >> >> -- >> View this message in context: >> http://old.nabble.com/How-to-make-a-cartesian-pairlist-from-a-vector--tp26452861p26452861.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. >> > > Charles C. Berry (858) 534-2098 > Dept of Family/Preventive > Medicine > E mailto:cbe...@tajo.ucsd.edu UC San Diego > http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901 > > ______________________________________________ > 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/How-to-make-a-cartesian-pairlist-from-a-vector--tp26452861p26485572.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.
