[R] extract columns from a dataframe

Sean Davis sdavis2 at mail.nih.gov
Mon Jul 5 15:04:06 CEST 2004


If you have a data.frame df like:

Col1  Col2  Col3 Col4
1     2     A    B

Then you should be able to do:


to get the second and fourth columns.


On 7/5/04 8:53 AM, "Rado Bonk" <rado.bonk at jrc.it> wrote:

> Dear R users,
> I'm coming back to R after while. I have a data frame with 200 columns,
> each column has a name. How to extract all columns to a new dataset, but
> the specified (by names) ones?
> I was playing with that for a little bit using the vector syntax but got
> several syntax errors.
> Thanks,
> Rado
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