Fwd: Re: [R] Combining many dataframes from listings of objects?

[Peter Dalgaard BSA]

"Derek Eder" <Derek.Eder at neuro.gu.se> writes:

> > I want to combine (rbind) many dataframes into a single data frame, but "automatically" 
> > specifying the names of the dataframes as listing of object names.
> > E.g., combine these 18 df objects into one big df using something conceptually like this :
> > rbind(objects(pattern="*.df"))
> 
> 
> Brian Ripley suggested that something along the lines of:  do.call("rbind", objects(pattern="*.df"))  
> 
> 
> But I can't make this fly on vectors.  E.g.,  
> 
> >  objects.of.desire_objects(pattern="*.df")
> > do.call("rbind.data.frame",list(as.name(objects.of.desire)))  # do.call needs a list and must be of class 'name'
> 
> Unfortunately, only the first data.frame in the series is read and returned.
> 
> 
> Any further nudges along the right direction anyone?

How about this?

do.call("rbind", lapply(objects(pattern="*.df"),get))

or 

eval(as.call(c(as.name(rbind), lapply(objects(pattern="*.df"), as.name))))

(NB: "How about" is code for "Not actually tried"!)
-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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