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

[Rainer Schuermann]

> colnames( df )[2]
[1] "c2"  


On Thursday 02 February 2012 07:31:33 ikuzar 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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