[Rd] 'unique' error message is printed despite silent=TRUE (PR#13547)

[Peter Dalgaard]

macrakis at alum.mit.edu wrote:
> In 2.8.0/Windows Vista:
> 
> When 'unique' gives a type error message, it prints out even if errors
> are being caught:
> 
>> try(unique(quote(hello)),silent=TRUE)
> hello
> 
> This comes from the .Internal unique routine:
> 
>> try(.Internal(unique(quote(hello),NULL,NULL)),silent=TRUE)
> hello
> 
> I guess it is using the internal equivalent of print rather than the
> internal equivalent of stop.
> 

silent=TRUE is a red herring (this has nothing to do with try()).

However, inside do_duplicated (unique.c) we have

     if (!isVector(x)) {
	PrintValue(x);
	error(_("%s() applies only to vectors"),
	      (PRIMVAL(op) == 0 ? "duplicated" : "unique"));
     }

This is due to

------------------------------------------------------------------------
r32306 | ripley | 2004-12-23 22:06:27 +0100 (Thu, 23 Dec 2004) | 2 lines

Apparently unique/duplicated are supposed to work on NULL, despite their 
help!

...which makes little sense to explain the PrintValue(x). I suspect this 
is a debugging printout that was inadvertently left in.


-- 
    O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
   c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
  (*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)              FAX: (+45) 35327907