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.