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

[ikuzar]

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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