On Tue, 2 Oct 2007, John Kane wrote:
> This is just a curiosity question. Why do the two
> different syntaxes for df1 and df2 give such different
> results in the names(dfx)?
Because only in the second case did you specify the names in the call.
When you do nas <- c("A" ...) the argument has no name but you create an
object called 'nas' in the calling environment (the workspace, it looks
like).
Perhaps you are confused by thinking '=' is an assignment operator in R,
but it is so only when it is not used in any other sense.
>
> Thanks
>
>
> df1 <- data.frame(nas = c("A", "B" , "B" ,"C" ,"B",
> "A", "D"),nums = c(3, 2, 1, 1, 2, 3, 7))
>
> df2 <- data.frame(nas <- c("A", "B" , "B" ,"C" ,"B",
> "A", "D"),nums <- c(3, 2, 1, 1, 2, 3,
> 7))
>
> df1; df2
>
>> df1
> nas nums
> 1 A 3
> 2 B 2
> . .
>
>> df2
>
> nas....c..A....B....B....C....B....A....D..
> nums....c.3..2..1..1..2..3..7.
> 1 A
> 3
> 2 B
>
> 3
> . .
>
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>
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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