[Rd] sort(list(..)) ?

[Peter Dalgaard BSA]

Martin Maechler <maechler@stat.math.ethz.ch> writes:

> in do_sort(.) in src/main/sort.c .
> This doesn't quite pass "make check" currently because
> 
>   is.factor(factor(list()))
> 
> now would give an error.

...which is no big loss, because already now

> factor(list(1,2,3))
Error in unique(x) : unique() applies only to vectors
> factor(list(1:3))
Error in unique(x) : unique() applies only to vectors

> I still think we should not silently allow list()s {or expression()s} as
> argument to sort() as we do now; BTW, we just return them unchanged.

Agreed. Unless someone feels a great need to generalize sort() to sort
complex structures that can only be stored in a list....

-- 
   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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