From Kurt.Hornik@ci.tuwien.ac.at  Wed Feb  7 15:57:27 2001
From: Kurt.Hornik@ci.tuwien.ac.at (Kurt Hornik)
Date: Wed, 7 Feb 2001 16:57:27 +0100
Subject: [Rd] RE: [R] Removing "row.names"
In-Reply-To: <Pine.A41.4.21.0102070752550.112748-100000@homer40.u.washington.edu>
References: <14977.28086.8858.910911@mithrandir.hornik.net>
 <Pine.A41.4.21.0102070752550.112748-100000@homer40.u.washington.edu>
Message-ID: <14977.28775.611743.933442@mithrandir.hornik.net>

>>>>> Thomas Lumley writes:

> On Wed, 7 Feb 2001, Kurt Hornik wrote:
>> >>>>> Yves Gauvreau writes:
>> 
>> > Try this
>> > sampled <- data.frame(sample(rnorm(100),2))
>> > colnames(sampled) <- " " # Or preferably something meaningful
>> > sampled
>> 
>> > 1 1.777068
>> > 2 0.937161
>> 
>> Ouch!
>> 
>> This *surely* is a bug.  How can it be possible to remove the variable
>> names in a data frame?

> He hasn't removed them, just set them to " ". We allow variable names
> that are not valid R names (in fact, we rely on them in model.frame).

Correct.  Let me rephrase the question: how can it be possible to set
the (variable) names in a data frame to something non-unique?

-k
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[Rd] RE: [R] Removing "row.names"
Kurt Hornik