Message-ID: <3ECA15C3.4060504@pdf.com>
Date: 2003-05-20T11:47:15Z
From: Sundar Dorai-Raj
Subject: conversion of a list element to a vector
Philippe Hup? 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
>
Need to use "[[" here. liste[var] is still a list. liste[[var]] is a
vector. I would avoid using "var" as a variable name since it is also
the function for computing the variance.
> 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.
>
lapply(liste, unique) returns a list of length(liste) containing the
unique values of each element in the list.
Regards,
Sundar