[R] conversion of a list element to a vector

[Prof Brian Ripley]

You meant [[var]] not [var].  liste[var] is a one-element list.

On Tue, 20 May 2003, Philippe Hupé wrote:

> Hello,
> 
> I would like to extract unique elements of a variable which belongs to a 
> list
> 
> liste <- list(V1=c(1,2,3,5,2), V2=c(1,2,3,4,5))
> var <- "V1"
> uni <- unique(liste[var]) #does not work
> 
> I know that liste[var]$V1 works but for my problem, the label variable 
> "V1" is only know through the var variable.
> 
> I can I do
> 
> Thanks in advance.
> 
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-- 
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)
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