FAQ 7.21. But there are perhaps slicker ways.
-- Bert Gunter Genentech Non-Clinical Statistics South San Francisco, CA > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Georg Otto > Sent: Friday, July 21, 2006 10:39 AM > To: r-help@stat.math.ethz.ch > Subject: [R] intersect of list elements > > > Hi, > > i have a list of several vectors, for example: > > > vectorlist > $vector.a.1 > [1] "a" "b" "c" > > $vector.a.2 > [1] "a" "b" "d" > > $vector.b.1 > [1] "e" "f" "g" > > > I can use intersect to find elements that appear in $vector.a.1 and > $vector.a.2: > > > intersect(vectorlist[[1]], vectorlist[[2]]) > [1] "a" "b" > > > I would like to use grep to get the vectors by their names matching an > expression and to find the intersects between those vectors. For the > first step: > > > vectorlist[grep ("vector.a", names(vectorlist))] > $vector.a.1 > [1] "a" "b" "c" > > $vector.a.2 > [1] "a" "b" "d" > > > Unfortunately, I can not pass the two vectors as argument to > intersect: > > > intersect(vectorlist[grep ("vector.a", names(vectorlist))]) > Error in unique(y[match(x, y, 0)]) : argument "y" is missing, > with no default > > I am running R Version 2.3.1 (2006-06-01) > > > Could somone help me to solve this? > > Cheers, > > Georg > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > ______________________________________________ R-help@stat.math.ethz.ch 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.
