[R] extract columns from a dataframe

[Yves Magliulo]

hi,

see colnames() 
simple use, good result.

ex: if df is your data.frame and toto = the column name you want to
extract do:

df2<-df[,colnames(df)==toto)] #extract all toto column



Le lun 05/07/2004 à 14:53, Rado Bonk a écrit :
> 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
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
-- 
------
Yves Magliulo <ym at climpact.com>
Climatology research department, CLIMPACT

Tel.   : +33 (0) 1 55 07 85 77
Fax.   : +33 (0) 1 55 07 85 79
Universite Pierre et Marie Curie
Boite 101 - Tour 45 - 5eme etage - Couloir 45/46
4 place Jussieu, 75252 Paris CEDEX 05, France