On Tue, Jul 12, 2011 at 1:17 PM, Sam Steingold <s...@gnu.org> wrote: > when do I need to use which()?
See ?which For examples, try: example(which) >> a <- c(1,2,3,4,5,6) >> a > [1] 1 2 3 4 5 6 >> a[a==4] > [1] 4 >> a[which(a==4)] > [1] 4 >> which(a==4) > [1] 4 >> a[which(a>2)] > [1] 3 4 5 6 >> a[a>2] > [1] 3 4 5 6 >> > > seems unnecessary... Yes, it can be used as a redudant wrapper as you have demonstrated in your examples. In those cases, it is most certainly unnecessary. > > -- > Sam Steingold (http://sds.podval.org/) on CentOS release 5.6 (Final) X > 11.0.60900031 > http://jihadwatch.org http://palestinefacts.org http://mideasttruth.com > http://truepeace.org http://thereligionofpeace.com > Good programmers treat Microsoft products as damage and route around it. > > ______________________________________________ > 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. > -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles https://joshuawiley.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.
