df <- data.frame(X1 = c(1,1,1,2,2), X2 = c(1,5,7,3,8)) > df X1 X2 1 1 1 2 1 5 3 1 7 4 2 3 5 2 8 > v <- with(df, tapply(X2, X1, c)) ## v is a list, and I would work directly with this rather than converting to a data.frame. But if you insist:
> df2 <- data.frame(v, row.names = names(v)) > df2[1,1] ## produces a **list** with a single component containing the vector c(1,5,7) [[1]] [1] 1 5 7 > df2[[1,1]] ## produces a vector -- note doubled brackets [1] 1 5 7 Cheers, Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Wed, Feb 17, 2021 at 6:50 AM A. Mani <a.mani....@gmail.com> wrote: > The original data frame can be like > Type Id > 1 1 > 1 5 > 1 7 > 2 3 > 2 8 > .. .... > > tapply(Id,Type,set) will yield the sets correctly (assuming the data > frame is attached) but not a data frame of the form mentioned. > > A similar ddply command does not work at all with the function 'set' > (while 'mean' etc work fine) > > Thanks and Best > > A Mani > > Prof.Dr.(Miss) A Mani > ASL, AMS, ISRS, CLC, CMS, MTA > Senior Member, International Rough Set Society > Research Scientist, Indian Statistical Institute, Kolkata > Formerly HBCSE, TIFR, CU. > Homepage: https://www.logicamani.in > Blog: https://logicamani.blogspot.in/ > Research Gate: https://www.researchgate.net/profile/Mani_A > sip:girlprofes...@ekiga.net > Pronouns: She/Her/Hers > > On Wed, Feb 17, 2021 at 4:24 PM Jim Lemon <drjimle...@gmail.com> wrote: > > > > Hi A, > > I'm unable to work out what you are using as input. Maybe: > > > > id<-data.frame(Type=c(1,2,1,1,2),set=c(1,3,5,7,8)) > > > > but that doesn't work with your > > > > tapply(id,Type,set) > > > > command. Perhaps a bit more detail? > > > > Jim > > > > > > > > On Wed, Feb 17, 2021 at 7:48 PM A. Mani <a.mani....@gmail.com> wrote: > > > > > > I want a data frame (derived from another data frame) of the form > > > > > > Type Set > > > 1 {1,5, 7} > > > 2 {3,8) > > > .. .... > > > > > > tapply(Id,Type, set) works, but does not yield a data frame. > > > 'set' is from package set/set6/etc > > > ddply does not seem to work with the function. > > > How should I proceed with this optimally? > > > > > > > > > Thanks and Best > > > > > > A Mani > > > > > > Prof.Dr.(Miss) A Mani > > > ASL, AMS, ISRS, CLC, CMS, MTA > > > Senior Member, International Rough Set Society > > > Research Scientist, Indian Statistical Institute, Kolkata > > > Formerly HBCSE, TIFR, CU. > > > Homepage: https://www.logicamani.in > > > Blog: https://logicamani.blogspot.in/ > > > Research Gate: https://www.researchgate.net/profile/Mani_A > > > sip:girlprofes...@ekiga.net > > > Pronouns: She/Her/Hers > > > > > > ______________________________________________ > > > 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. > > ______________________________________________ > 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. > [[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.