Try this:

do.call(rbind, lapply(lapply(l, unlist), "[", unique(unlist(c(sapply(l,
names))))))

On Mon, Dec 29, 2008 at 7:35 PM, Mark Heckmann <mark.heckmann@gmx.de> wrote:

> thanks for the elegant solution!
>
> It worked out fine in my case, but when I tried to understand what it does
> I discovered one little issue.
>
> l <- list(data.frame(a=1, b=2), data.frame(a=2, c=3))
> do.call(rbind, lapply(l, "[", unique(unlist(sapply(l, names)))))
>
> will not work. Neither the following list.
>
> l <- list(data.frame(a=1, b=2), data.frame(a=2, c=3, d=5))
>
> I am not able to figure out why. Does anyone know what could be done to fix
> it?
>
> TIA, Mark
>
>
> -------- Original-Nachricht --------
> > Datum: Mon, 29 Dec 2008 16:17:22 -0200
> > Von: "Henrique Dallazuanna" <wwwhsd@gmail.com>
> > An: "Mark Heckmann" <mark.heckmann@gmx.de>
> > CC: r-help@r-project.org
> > Betreff: Re: [R] Merge or combine data frames with missing columns
>
> > Try this:
> >
> > do.call(rbind, lapply(l, "[", unique(unlist(sapply(l, names)))))
> >
> > Where "l" is your list.
> >
> > On Mon, Dec 29, 2008 at 12:18 PM, Mark Heckmann
> > <mark.heckmann@gmx.de>wrote:
> >
> > >
> > > Hi R-experts,
> > >
> > > suppose I have a list with containing data frame elements:
> > >
> > > [[1]]
> > > (Intercept)          y1          y2          y3          y4
> > >  -6.64              0.761      0.383      0.775      0.163
> > >
> > > [[2]]
> > > (Intercept)          y2          y3
> > > -3.858             0.854      0.834
> > >
> > > Now I want to put them into ONE dataframe like this:
> > >               (Intercept)           y1          y2         y3
> > y4
> > >   1           -6.64              0.761      0.383      0.775      0.163
> > >   2         -3.858                  NA       0.854      0.834        NA
> > >
> > > The problem I encounter is that not always all possible columns
> > (Intercept,
> > >  y1,  y2, y3,  y4) exist or at least have NA entries .
> > >
> > > I cannot figure out how (e.g. with merge)...
> > >
> > > TIA, Mark
> > >
> > >
> > > --
> > > Mark Heckmann (Dipl. Wirt.-Ing.)
> > > phone +49 (0) 421/1614618
> > >
> > > Sensationsangebot verlängert: GMX FreeDSL - Telefonanschluss + DSL
> > > für nur 16,37 Euro/mtl.!* http://dsl.gmx.de/?ac=OM.AD.PD003K1308T4569a
> > >
> > > ______________________________________________
> > > 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.
> > >
> >
> >
> >
> > --
> > Henrique Dallazuanna
> > Curitiba-Paraná-Brasil
> > 25° 25' 40" S 49° 16' 22" O
>
> --
> Mark Heckmann (Dipl. Wirt.-Ing.)
> phone +49 (0) 421/1614618
>
> Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen:
> http://www.gmx.net/de/go/multimessenger
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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