[R] extra arguments in do.call applied to a list of dataframes

[Ista Zahn]

I would just move the row.names to a column, and use Reduce instead of
do.call. Like this:

mylist <- lapply(mylist, function(x) data.frame(row = rownames(x), x))
Reduce(function(x, y){merge(x, y, by = "row", all=TRUE)}, mylist)

Best,
Ista

On Sat, Jan 17, 2015 at 11:37 AM, Remi Genevest <rgenevest at free.fr> wrote:
> Hello,
>
> I have a list of dataframes with different number of rows and I want to bind
> columns by rownames and put some NAs where rownames do not match.
>
> I was thinking about doing something like this :
>
> do.call(merge,c(mylist,by="row.names",all.x=TRUE))
>
> but I get the following error message :
>
> /Erreur dans fix.by(by.x, x) :
>   'by' doit spécifier lune ou plusieurs colonnes comme des entiers, des noms
> ou des valeurs logiques
> /
>
> Have you any ideas to fix it?
>
> Thing is that it works fine when I try with a list of 2 dataframes, but goes
> wrong with 3 and more dataframes. (see examples below)
>
> ## works well with 2 dataframes :
> mylist<-list()
> mylist[[1]]<-data.frame(y=seq(1,10))
> mylist[[2]]<-data.frame(y=seq(1,5))
> do.call(merge,c(mylist,by="row.names",all.x=TRUE))
>
>    Row.names y.x y.y
> 1          1   1   1
> 2         10  10  NA
> 3          2   2   2
> 4          3   3   3
> 5          4   4   4
> 6          5   5   5
> 7          6   6  NA
> 8          7   7  NA
> 9          8   8  NA
> 10         9   9  NA
>
> ## fails with 3 df :
> mylist<-list()
> mylist[[1]]<-data.frame(y=seq(1,10))
> mylist[[2]]<-data.frame(y=seq(1,5))
> mylist[[3]]<-data.frame(y=seq(1,7))
> do.call(merge,c(mylist,by="row.names",all.x=TRUE))
>
> /Erreur dans fix.by(by.x, x) :
>   'by' doit spécifier lune ou plusieurs colonnes comme des entiers, des noms
> ou des valeurs logiques/
>
> Thanks for help !!
>
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/extra-arguments-in-do-call-applied-to-a-list-of-dataframes-tp4701915.html
> Sent from the R help mailing list archive at Nabble.com.
>
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