Update: The whole problem was due to set() from library sets. 'sets' is not a very consistent package, and users should be warned.
Set$new() and as.Set() from set6 work in a predictable, object-oriented way. 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 9:50 PM Bert Gunter <bgunter.4...@gmail.com> wrote: > > 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. ______________________________________________ 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.