Dear Bert, Thanks a lot for help. I tried and got:
> x2[x2[["name"]] %in% y,] [1] name id <0 rows> (or 0-length row.names) > Any suggestions? Alex On Fri, Apr 11, 2008 at 2:49 PM, Bert Gunter <[EMAIL PROTECTED]> wrote: > 1. Strictly speaking, y is a one-column matrix if it has a non-null dim > attribute (it also is a vector). > > 2. ?match or ?"%in%" tells you what to do. > > x2[x2[["name"]] %in% y,] > > is what you want. > > > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On > Behalf Of ss > Sent: Friday, April 11, 2008 11:23 AM > To: r-help@r-project.org > Subject: [R] How to match some patterns in a matrix > > Dear all, > > I have a data frame called x2, which looks like: > > > dim(x2) > [1] 2237 2 > > x2[1:4,1:2] > name id > 1 STye hggd3 > 2 STy2 bffbd2 > 3 qw22e bdbdbbbd7 > 4 deffrdff nnshfd3 > > and a vector called y, which looks like: > > > dim(y) > [1] 135 1 > > y[1:3,1] > [1] ABCDE BDH5 DESRP1 > > y is a subset of x2$name and I want to select the rows in x2 whose 'name' > match > y. Is there an easy way to do so? > > I tried subset(x2, y) but it did not work. > > Thanks much for your advice. > > Alex > > [[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. > > [[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.
