[R] dataframes without data

[Peter Dalgaard BSA]

"Wolfgang Koller" <koller2 at fgr.wu-wien.ac.at> writes:

>  Hi!
> 
> Yesterday I posted the following problem:
> 
> > There seems to be some inconsistency in the following behaviour:
> > 
> > > MYDATA <- data.frame(b=c("A","B","C"),x=c(1,2,3))
> > > MYDATA
> >   b x
> > 1 A 1
> > 2 B 2
> > 3 C 3
> > > MYDATAnew <- MYDATA[0:0,]
> > > MYDATAnew
> > [1] b x
> > <0 rows> (or 0-length row.names)
> > > MYDATAnew <- rbind(MYDATA[0:0,],MYDATA)
> > > MYDATAnew
> >   b x
> > 1 1 1
> > 2 2 2
> > 3 3 3
> > 
> > Does R forget the type of the columns of a data.frame when the
> > data.frame contains no data??

This seems to be fixed in the upcoming version, but the example scared
up a bug in the new code (thanks!).


> MYDATAnew <- rbind(MYDATA[0:0,],MYDATA)
> MYDATAnew
  b x
1 A 1
2 B 2
3 C 3



-- 
   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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