Thank you both for your help! I was interested in how to get at either element specifically. Your solutions work fine though. If I need the first element its lapply(thelist,'[[',1) and if I need the second its lapply(thelist,'[[',1).
Thanks again, you just saved me a slow for loop! Kind regards, Greg On Sep 30, 2010, at 7:39 PM, Phil Spector wrote: > Gregory - > I'm confused -- if the first element is the matrix you > want, why would you use 2 as an index? > Here's a way to get a list with the first elements of each > member of a list: > > lapply(thelist,'[[',1) > > - Phil Spector > Statistical Computing Facility > Department of Statistics > UC Berkeley > spec...@stat.berkeley.edu > > > On Thu, 30 Sep 2010, Gregory Ryslik wrote: > >> Hi, >> >> I have a list of of n elements (where n is unknown beforehand). Each element >> of the list has two subelements. The first is a matrix, the second is a >> number. I want to make a list of just the matrices. >> >> I want to do something like mylists[[ ,2]] but that obviously doesn't work. >> Is there a simple way to get around this? >> >> Thanks! >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
