Hi Sean, Comment in line below. On Thu, Oct 22, 2009 at 5:39 PM, Sean MacEachern <sean.mace...@gmail.com> wrote: > Hi, > > I'm running into a problem subsetting a data frame that I have never > encountered before: > >> dim(chkPd) > [1] 3213 6 > >> df = head(chkPd) >> df > PN WB Sire Dam MG SEX > 601 1001 715349 61710 61702 67 F > 969 1001_1 511092 616253 615037 168 F > 986 1002_1 511082 616253 623905 168 F > 667 1003 715617 61817 61441 67 F > 1361 1003_1 510711 635246 627321 168 F > 754 1004 715272 62356 61380 67 F > > >> dfb = chkPd[df$PN,] >> dfb > PN WB Sire Dam MG SEX > 1001 2114_1 510944 616294 614865 168 M > NA <NA> NA <NA> <NA> NA <NA> > NA.1 <NA> NA <NA> <NA> NA <NA> > 1003 1130_1 510950 616294 619694 168 F > NA.2 <NA> NA <NA> <NA> NA <NA> > 1004 2221-SHR2 510952 616294 619694 168 M > > > I'm not sure why I'm getting this behaviour? By sub-setting the > original data frame by PN I seem to be pulling out row numbers? > Therefore I am only getting results where PN is less than the > dimensions of the original data frame and of course nothing where PN > has _ in the id. I have also tried using subset but haven't had any > luck with that either.
That is the documented behavior as far as I can tell. See ?"[.data.frame" Maybe my brain is going soft at the end of a long day, but I can't tell what you're trying to do. Can you clarify? -Ista > > >>dfb = subset(chkPd, PN==df$PN) > Warning message: > In PN == df$PN : > longer object length is not a multiple of shorter object length > > I wasn't aware that both the larger data frame had to be a multiple of > the object you were sub-setting . In any case I would appreciate any > insight into what I may be doing wrong. > > Cheers, > > Sean > > >> sessionInfo() > R version 2.9.1 (2009-06-26) > i386-apple-darwin8.11.1 > > locale: > en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8 > > attached base packages: > [1] splines stats graphics grDevices utils datasets methods base > > ______________________________________________ > 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. > -- Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org ______________________________________________ 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.