[R] extract columns from a dataframe

[John Fox]

Dear Rado,

If the data frame is named df and nms is a vector names of the columns that
you want to exclude, then

df[,-sapply(nms, function(x) which(x == names(df)))] 

Should give you what you want.

I hope that this helps,
 John

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Rado Bonk
> Sent: Monday, July 05, 2004 7:54 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] extract columns from a dataframe
> 
> 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.