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
On 1/24/06 8:21 AM, "Thomas Steiner" <finbref.2006 at gmail.com> wrote:> 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).This may not be the best solution, but: lapply(a,function(x) {x$s}) will get your answer, I think. Sean
> lapply(a, "[[", "s")$"2006-01-23" [1] 7 12 12 11 4 $"2006-01-24" [1] 3 8 8 9 12 This is what you need? G. On Tue, Jan 24, 2006 at 02:21:18PM +0100, Thomas Steiner wrote:> 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 > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html-- Csardi Gabor <csardi at rmki.kfki.hu> MTA RMKI, ELTE TTK
probably you need:
sapply(a, "[[", "s")
I hope it helps.
Best,
Dimitris
----
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/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- 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
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
lapply(a,"[[","s") Thomas Steiner a ??crit :>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 > >______________________________________________ >R-help at stat.math.ethz.ch mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > > >