Dynamically build variable names
On Mon, May 17, 2010 at 11:12 AM, jim holtman <jholtman at gmail.com> wrote:
?'[[' What I think you want is: x <- "V1_1" mean(l[[x]]) Also you need to look at 'get'.
...and if the answer is get() or assign() you should usually consider
library("fortunes"); fortune("rethink the question");
/Henrik
On Mon, May 17, 2010 at 4:41 AM, Stefan Petersson < stefan.petersson at inizio.se> wrote:
I'm trying to dynamically build variable names to use on a list. Let's say
I have a list like this one:
l <- list(V1_1=c(1,2,3), V1_2=c('One','Two','Three'))
And I succesfully build my variable name like this:
paste('l$', 'V1_1', sep='')
Why can't I just run a mean call with the pasted variable name?
mean(paste('l$', 'V1_1', sep=''))
So, my question is; How do one build variable names dynamically to be able
to use them on an R list.
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sessionInfo()
R version 2.11.0 (2010-04-22) i486-pc-linux-gnu locale: ?[1] LC_CTYPE=en_US.utf8 ? ? ? ? ?LC_NUMERIC=C ?[3] LC_TIME=en_US.utf8 ? ? ? ? ? LC_COLLATE=en_US.utf8 ?[5] LC_MONETARY=en_US.utf8 ? ? ? LC_MESSAGES=en_US.utf8 ?[7] LC_PAPER=en_US.utf8 ? ? ? ? ?LC_NAME=en_US.utf8 ?[9] LC_ADDRESS=en_US.utf8 ? ? ? ?LC_TELEPHONE=en_US.utf8 [11] LC_MEASUREMENT=en_US.utf8 ? ?LC_IDENTIFICATION=en_US.utf8 attached base packages: [1] stats ? ? graphics ?grDevices utils ? ? datasets ?methods ? base other attached packages: [1] foreign_0.8-40 loaded via a namespace (and not attached): [1] tools_2.11.0
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-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? ? ? ? ?[[alternative HTML version deleted]]
______________________________________________ R-help at 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.