[R] Extracting a column name in loop?

[Moshe Olshansky]

If df is your dataframe then names(df) contains the column names and so names(df)[i] is the name of i-th column.

--- On Thu, 9/7/09, mister_bluesman <mister_bluesman at hotmail.com> wrote:

> From: mister_bluesman <mister_bluesman at hotmail.com>
> Subject: [R]  Extracting a column name in loop?
> To: r-help at r-project.org
> Received: Thursday, 9 July, 2009, 1:41 AM
> 
> Hi,
> 
> I am writing a script that will address columns using
> syntax like: 
> 
> data_set[,1] 
> 
> to extract the data from the first column of my data set,
> for example. This
> code will be placed in a loop (where the column reference
> will be placed by
> a variable). 
> 
> What I also need to do is extract the column NAME for a
> given column being
> processed in the loop. The dataframe has been set so that R
> knows that the
> top line refers to column headers. 
> 
> Can anyone help me understand how to do this?
> 
> Thanks.
> -- 
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