[R] pooling categories in a contingency table

[Robert Gentleman]

On Wed, Apr 24, 2002 at 05:57:55PM +0200, Peter Dalgaard BSA wrote:
> Michael Friendly <friendly at yorku.ca> writes:
> 
> ....
> >     for (i in 1:nargs) {
> >         vals <- args[[i]]
> >         nm <- names[[i]]
> >         print(cat("vals: ", vals, "\n"))
> >         print(cat("nm: ", nm, "\n"))
> >         levels(table$nm) <- vals

 The "problem" is that $ does not evaluate its second argument (which
 is unlike all other operators in S) so as Peter says you can use
 table[[nm]] since the "[[" operator does evaluate its argument.


> >         }
> ....
> 
> > From the output below, I see what the problem is, but don't know
> > how to fix it:
> ...
> > Can someone help?
> 
> table$nm looks for a component called "nm". I think you want 
> table[[nm]].
> 
> -- 
>    O__  ---- Peter Dalgaard             Blegdamsvej 3  
>   c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
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