[R] How to retrieve a column name of a data frame

[R. Michael Weylandt]

colnames(df)[2]

Michael

On Thu, Feb 2, 2012 at 10:31 AM, ikuzar <razuki at hotmail.fr> wrote:
> Hi,
>
> I 'd like to know how to retrieve a column name of a data frame. For
> instance :
>
> df = data.frame(c1=c('a','b'),c2=c(1,2))
>> df
>  c1 c2
> 1  a  1
> 2  b  2
>
> I would like to retrieve the column name which value is 2 (here, the column
> is c2)
>
> thanks for your help
>
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