From p.dalgaard at biostat.ku.dk  Sun Feb 22 21:16:18 2009
From: p.dalgaard at biostat.ku.dk (Peter Dalgaard)
Date: Sun, 22 Feb 2009 21:16:18 +0100
Subject: [Rd] 'unique' error message is printed despite
	silent=TRUE	(PR#13547)
In-Reply-To: <20090222191519.17912282C76C@mail.pubhealth.ku.dk>
References: <20090222191519.17912282C76C@mail.pubhealth.ku.dk>
Message-ID: <49A1B292.1070908@biostat.ku.dk>

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.


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