[R] Converting "list of data frame" to data frame

[John Kane]

I just tried an artifical example and the approach
seems to work okay

# Joining data.frames stored in a list
# From "Douglas Bates"

aa <- 1:4
bb <- 2:5
cc <- 3:6
dd <- 4:7
ee <- 5:8
ff <- c(rep(NA,4))
gg <- 6:9

lst <- list(data.frame(aa,bb), data.frame(cc,dd),
data.frame(ee,ff,gg))
 tatiana <- names(lst)  <-  c("A", "C", "E")
 
maxy  <- do.call("rbind", c(lst$A, lst$C, lst$E)) ;
maxy 

miny  <- do.call("cbind", c(lst$A, lst$C, lst$E)) ;
miny

What are the dimensions of your data frames?
--- Ajit Pawar <ajitpawar75 at gmail.com> wrote:

> Douglas/R-help,
>         Thanks for your reply. I did try the
> solution but the result is not
> what I expect and I also get the following warning
> message:
> 
> -------------------
>  Warning message:
>  number of columns of result
>         is not a multiple of vector length (arg 1)
> in: rbind(1, c(6, 9, 10,
> 12, 13, 14, 19, 22, 29, 30, 42, 45, 47,
>  -------------------
> 
>         The "list of data frames" that sapply
> returns has same number of
> columns *but* different number of rows depending on
> the index of sapply.
> 
>         Any idea what might be going wrong?
> 
>         Many thanks in advance!.
> 
> Cheers
> 
> AP
> 
> 
> 
> 
> 
> 
> On 4/29/07, Douglas Bates <bates at stat.wisc.edu>
> wrote:
> >
> > On 4/28/07, Ajit Pawar <ajitpawar75 at gmail.com>
> wrote:
> > > Greetings,
> > >       This might be something very simple but a
> nice solution eludes
> > me!!
> > >
> > >        I have a function that I call within
> sapply that generates data
> > frame
> > > in each call. Now when sapply returns me back
> the result - it's in the
> > form
> > > of a "list of data frames". so in order to
> extract the information into
> > a
> > > single data frame I have to loop thru the
> following code:
> > >
> > >        for(i=1:n) {
> > >            my.df =
> rbind(my.df,list.from.sapply[,i]);
> > >        }
> > >
> > >    Is there anyway to code it better?
> >
> > do.call("rbind", my.df.list.from.sapply)
> >
> 
> 	[[alternative HTML version deleted]]
> 
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