On Fri, Sep 10, 2010 at 9:22 AM, omerle <ome...@laposte.net> wrote: >> Message du 10/09/10 14:53 >> De : "Ista Zahn" >> A : "omerle" >> Copie à : r-help@r-project.org >> Objet : Re: [R] Data.frames : difference between x$a and x[, "a"] ? - How >> set new values on x$a with a as variable ? >> >> >> Hi, >> >> On Fri, Sep 10, 2010 at 4:05 AM, omerle wrote: >> > Hi, >> > >> > I got two questions : >> > >> > 1st Question >> > a="S" >> > b=data.frame(S=3) >> > do.call(`<-`,list(do.call(`$`,list(b,"S")),5)) >> >> I think there is some confusion here. Why are you setting a equal to >> "S" but then never using it? >> >> > => How can I put new values on S column having the column name as a >> > variable ? >> >> I'm having trouble parsing this. What exactly do you want to do? > 1 - Put a list as an element of a data.frame. That's quite convenient for my > pricing function.
I think this is a really bad idea. data.frames are not meant to be used in this way. Why not use a list of lists? > >> > >> > 2 nd Question >> > a="S" >> > b=data.frame(S=3) >> > b[,"S"]=list(1:10) #Doesnt works >> > b$S=list(1:10) #Works >> > => Isnt the same thing ? What is the difference between these two things ? >> >> I believe b[["S"]] is the same as b$S, b[,"S"] is different. But I >> have to question your assertion that b$S=list(1:10) "Works". This is a >> very odd construction (putting a list as an element of a data.frame) >> and is almost certainly not what you want. > 2 - That's what I want. I figured out just five minutes ago that b[["S"]] > works because it's the same thing as b$S. > But I still dont know what is b[,"S"] compared to b[["S"]] see ?"[" >> > >> > >> > Thanks, >> > >> > Une messagerie gratuite, garantie à vie et des services en plus, ça vous >> > tente ? >> > Je crée ma boîte mail www.laposte.net >> > >> > [[alternative HTML version deleted]] >> > >> > >> > ______________________________________________ >> > R-help@r-project.org mailing list >> > 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. >> > >> > >> >> >> >> -- >> Ista Zahn >> Graduate student >> University of Rochester >> Department of Clinical and Social Psychology >> http://yourpsyche.org >> >> > > Une messagerie gratuite, garantie à vie et des services en plus, ça vous > tente ? > Je crée ma boîte mail www.laposte.net > > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org mailing list > 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. > > -- Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org ______________________________________________ R-help@r-project.org mailing list 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.
