I'm not sure I understand what you're looking for in the result. What exactly do you mean by a "match"? What do you want in the third table besides the class names?
Do you just want a list (not a data frame) of those class names which table A and table B have in common? Then how about intersect(A$class,B$class)? If you want to do something like a SQL join of tables A and B, where rows are paired up based on common values of the class name, then take a look at the "merge" function. -s On Mon, Nov 17, 2008 at 3:04 PM, Alina Sheyman <[EMAIL PROTECTED]> wrote: > My question is probably pretty basic, but since I'm really new to R, here it > goes .... > > I have two separate data frames that include class names and various other > information on classes. I'm trying to create a match based on class names > and if a match exists to create a third data frame with the class name. > > I was hoping to accomplish this with sapply, but I can't figure out if I can > embed an "if statement" with sapply. Does anyone know if that's a legit way > to accomplish what I am trying to do or is there some better way? > > thank you, > > Alina Sheyman > > [[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. > ______________________________________________ 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.