Thank you, Bert. I'll be honest - I am just learning dplyr and was wondering if one could do it in dplyr. But of course your solution is perfect...
On Tue, Jun 16, 2015 at 1:50 PM, Bert Gunter <bgunter.4...@gmail.com> wrote: > Well, dplyr seems a bit of overkill as it's so simple with plain old > vapply() in base R : > > >> dat <- data.frame (a=sample(1:5,10,rep=TRUE), > + b=sample(3:7,10,rep=TRUE), > + g = sample(7:9,10,rep=TRUE)) > >> vapply(dat,function(x)sum(x==5,na.rm=TRUE),1L) > > a b g > 5 4 0 > > > > Cheers, > Bert > > Bert Gunter > > "Data is not information. Information is not knowledge. And knowledge is > certainly not wisdom." > -- Clifford Stoll > > On Tue, Jun 16, 2015 at 10:24 AM, Dimitri Liakhovitski > <dimitri.liakhovit...@gmail.com> wrote: >> >> Hello! >> >> I have a data frame: >> >> md <- data.frame(a = c(3,5,4,5,3,5), b = c(5,5,5,4,4,1), c = >> c(1,3,4,3,5,5), >> device = c(1,1,2,2,3,3)) >> myvars = c("a", "b", "c") >> md[2,3] <- NA >> md[4,1] <- NA >> md >> >> I want to count number of 5s in each column - by device. I can do it like >> this: >> >> library(dplyr) >> group_by(md, device) %>% >> summarise(counts.a = sum(a==5, na.rm = T), >> counts.b = sum(b==5, na.rm = T), >> counts.c = sum(c==5, na.rm = T)) >> >> However, in real life I'll have tons of variables (the length of >> 'myvars' can be very large) - so that I can't specify those counts.a, >> counts.b, etc. manually - dozens of times. >> >> Does dplyr allow to run the count of 5s on all 'myvars' columns at once? >> >> >> -- >> Dimitri Liakhovitski >> >> ______________________________________________ >> 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. > > -- Dimitri Liakhovitski ______________________________________________ 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.