Hi, It's related to how NAs are treated in comparison operations. See the Details section of https://www.rdocumentation.org/packages/base/versions/3.4.1/topics/Comparison <https://www.rdocumentation.org/packages/base/versions/3.4.1/topics/Comparison>
You can try something like this... x[which(x[,2] %in% 0),] # [,1] [,2] # [1,] 4 0 # [2,] 5 0 ... but I'm not sure if it is bullet proof. Others may have more insight. Cheers, Ben > On Oct 24, 2017, at 3:05 PM, BooBoo <boo...@gforcecable.com> wrote: > > This has every appearance of being a bug. If it is not a bug, can someone > tell me what I am asking for when I ask for "x[x[,2]==0,]". Thanks. > > > #here is the toy dataset > > x <- rbind(c(1,1),c(2,2),c(3,3),c(4,0),c(5,0),c(6,NA), > + c(7,NA),c(8,NA),c(9,NA),c(10,NA) > + ) > > x > [,1] [,2] > [1,] 1 1 > [2,] 2 2 > [3,] 3 3 > [4,] 4 0 > [5,] 5 0 > [6,] 6 NA > [7,] 7 NA > [8,] 8 NA > [9,] 9 NA > [10,] 10 NA > > > > #it contains rows that have NA's > > x[is.na(x[,2]),] > [,1] [,2] > [1,] 6 NA > [2,] 7 NA > [3,] 8 NA > [4,] 9 NA > [5,] 10 NA > > > > #seems like an unreasonable answer to a reasonable question > > x[x[,2]==0,] > [,1] [,2] > [1,] 4 0 > [2,] 5 0 > [3,] NA NA > [4,] NA NA > [5,] NA NA > [6,] NA NA > [7,] NA NA > > > > #this is more what I was expecting > > x[which(x[,2]==0),] > [,1] [,2] > [1,] 4 0 > [2,] 5 0 > > > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. Ben Tupper Bigelow Laboratory for Ocean Sciences 60 Bigelow Drive, P.O. Box 380 East Boothbay, Maine 04544 http://www.bigelow.org Ecocast Reports: http://seascapemodeling.org/ecocast.html Tick Reports: https://report.bigelow.org/tick/ Jellyfish Reports: https://jellyfish.bigelow.org/jellyfish/ [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
