On Wed, May 27, 2009 at 6:37 AM, Zeljko Vrba <zv...@ifi.uio.no> wrote:
> Given an arbitrary data frame, it is easy to exclude a column given its
> index:
> df[,-2]. How to do the same thing given the column name? A naive attempt
> df[,-"name"] did not work :)
>
Various ways:
Boolean index vector:
df[ , names(df) != "name" ]
List of wanted column names:
df[ , setdiff(names(df), "name") ]
Negated list of unwanted column indexes:
df[ , -match("name",names(df)) ]
df[ , -which(names(df) == "name") ]
The special 'subset' hack for column names; beware, I think this is the only
place in R where you can negate a column name.
subset(df , select = -a )
Hope this helps,
-s
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