Re: [R] colnames of a column

From: Peter Alspach <PAlspach_at_hortresearch.co.nz>
Date: Fri, 20 Jun 2008 11:27:09 +1200

Alfredo

> -----Original Message-----
> From: r-help-bounces_at_r-project.org
> [mailto:r-help-bounces_at_r-project.org] On Behalf Of Alfredo
> Alessandrini
> Sent: Friday, 20 June 2008 10:56 a.m.
> To: r-help_at_r-project.org
> Subject: [R] colnames of a column
>
> Hi,
>
> With this data.frame:
>
> > class(rwl)
> [1] "data.frame"
>
> >rwl
> 0028002F 0028013F 0028032F
> 1833 3.39 NA NA
> 1834 3.09 NA NA
> 1835 3.05 NA NA
> 1836 3.31 NA NA
> 1837 2.26 NA NA
>
> > colnames(rwl)
> [1] "0028002F" "0028013F" "0028032F"
>
> Ok....
>
> > colnames(rwl[,1])
> NULL
>
> why?? I expect: "0028002F"

Because rwl[,1] is a numeric vector and not a dataframe:

is.data.frame(rwl[,1])
[1] FALSE You probably want

names(rwl)[1]

HTH .... Peter Alspach

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