R devel - Apr 1997 - R-alpha: list assignment

This works in Splus:
> x<-list()
> x[["f"]]<-1
> zz<-"g"
> x[[zz]]<-2 
> x
$f:
[1] 1

$g:
[1] 2

In R both variants fail unless the name is already on the list. The
first one can be replaced by x$f, but there's seems to be no
substitute for the other one (oh yes I found one, but it's not fit to
print!). This comes up if you e.g. want to create a variable in a data
frame with a name given by a character string.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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Peter,
  They don't work on purpose. Basically this is the same problem as indexing
beyond the end of an array. In almost all cases it is an error.
To add a variable with a specific name to a data frame how about

x (the dataframe)
var1 the variable
name1 the name

 x<-cbind(x,var1)
 names(x)[ncol(x)]<-name1


robert
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