R help - Feb 2001 - Remove columns by name data[-c("subj","drug")]

Is there an easy way to remove data frame columns
by name instead of by index? The following gives
the idea

remove<-c("subj","drug")
data[-remove]

I found a solution with a few evals and substitutes,
similar to that used in reshapeLong, but there must
be an easier way out.

Dieter


---------------------------------------
Dr. Dieter Menne
Biomed Software
72074 T?bingen
Tel (49) (7071) 52176
FAX (49) (7071) 55 10 46
dieter.menne at menne-biomed.de
www.menne-biomed.de

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On Tue, 27 Feb 2001, Dieter Menne wrote:
> Is there an easy way to remove data frame columns
> by name instead of by index? The following gives
> the idea
>
> remove<-c("subj","drug")
> data[-remove]
>
> I found a solution with a few evals and substitutes,
> similar to that used in reshapeLong, but there must
> be an easier way out.
data[-match(remove, names(data))]

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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"Dieter Menne" <dieter.menne at menne-biomed.de> writes:
> Is there an easy way to remove data frame columns
> by name instead of by index? The following gives
> the idea
> 
> remove<-c("subj","drug")
> data[-remove]
> 
> I found a solution with a few evals and substitutes,
> similar to that used in reshapeLong, but there must
> be an easier way out.
subset(data, select=-c(subj, drug))

or

remove<-c("subj","drug")
data[-match(remove, names(data))]
-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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