From p.dalgaard at biostat.ku.dk  Thu Oct 14 18:51:41 2004
From: p.dalgaard at biostat.ku.dk (Peter Dalgaard)
Date: Thu Oct 14 18:54:47 2004
Subject: [Rd] is.vector() gives error (PR#7288)
In-Reply-To: <20041014162543.92EC710452@slim.kubism.ku.dk>
References: <20041014162543.92EC710452@slim.kubism.ku.dk>
Message-ID: <x21xg19raa.fsf@biostat.ku.dk>

j.j.goeman@lumc.nl writes:

> I get a strange error:
> 
> > is.vector(1:10)
> Error: recursive default argument reference

Hmm. I can't reproduce that on Linux...
 
> What's recursive about is.vector?

Nothing. You generally get that error if two arguments refer to
eachother, as in

> f <- function(x=y,y=x)x+y
> f(1)
[1] 2
> f(,1)
[1] 2
> f()
Error in f() : recursive default argument reference

but nothing of that sort is going on in is.vector. Unless it somehow
got redefined --- are you sure that you got the original is.vector
there? 

>  is.vector
function (x, mode = "any")
.Internal(is.vector(x, mode))
<environment: namespace:base>

The other possibility is that you're tickling a low-level, system
dependent bug in the evaluator. Can anyone reproduce this?

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
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[Rd] is.vector() gives error (PR#7288)
Peter Dalgaard