[R] column of a list

Dimitris Rizopoulos dimitris.rizopoulos at med.kuleuven.be
Tue Jan 24 14:43:08 CET 2006

probably you need:

sapply(a, "[[", "s")

I hope it helps.


Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/

----- Original Message ----- 
From: "Thomas Steiner" <finbref.2006 at gmail.com>
To: <r-help at stat.math.ethz.ch>
Sent: Tuesday, January 24, 2006 2:21 PM
Subject: [R] column of a list

>I have a list of (same type) lists. I want to retrieve the same
> entries of all my objects in the outer list.
> eg:
> a<-list("2006-01-23"=list(r=5,s=c(7,12,12,11,4)),
> "2006-01-24"=list(r=6,s=c(3,8,8,9,12)))
> a[][["s"]]
> gives NULL, but I am looking for all the s-vectors in order to plot
> and compare them (e changes to f in a day).
> Thomas
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