HI, Try this: To extract kappa: list1<-list(X199997=data.frame(xi=784.77,alpha=165.406,kappa=-0.2709),X19998=data.frame(xi=860.783,alpha=215.114,kappa=-0.1769)) sapply(list1,`[`,3) #$X199997.kappa #[1] -0.2709
#$X19998.kappa [1] -0.1769 #To extract alpha: sapply(list1,`[`,2) #$X199997.alpha #[1] 165.406 #$X19998.alpha #[1] 215.114 #To extract xi: sapply(list1,`[`,1) A.K> ----- Original Message ----- From: Balqis <aehan3...@gmail.com> To: r-help@r-project.org Cc: Sent: Tuesday, October 16, 2012 7:17 AM Subject: [R] how to extract from list Hi all, I have a list of 20000 data, and the list look like below. I wonder what is the simplest way to extract 'kappa' value (or 'xi' or 'alpha' for the matter) from each of the data. How can I simply code it without having to change the list to a dataframe first? Many thanks! $X19997 xi alpha kappa 784.7718640 165.4065141 -0.2709599 $X19998 xi alpha kappa 860.7832604 215.1144980 -0.1769741 $X19999 xi alpha kappa 839.7692675 196.0103874 -0.3848809 $X20000 xi alpha kappa 847.6117040 212.3279185 -0.2576029 regards, aehan [[alternative HTML version deleted]] ______________________________________________ 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.
