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 > > >