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Extract information from the names of a list within lapply
4 messages · Joshua Wiley, Henrique Dallazuanna, Jun Shen
Hi Jun,
On Fri, Apr 15, 2011 at 11:14 AM, Jun Shen <jun.shen.ut at gmail.com> wrote:
Dear list, I want to loop over a list through lapply and at the same time I want to extract some information from the names of the list elements. lapply does not seem to carry the names. Is there anyway to access the names of a list within lapply? Thanks.
Not in the way you are probably trying to do it, but consider:
## 1 (what you are probably doing)
lapply(mtcars, mean)
## 2 (an alternative)
lapply(colnames(mtcars), function(x) {cat(x, fill = TRUE); mean(mtcars[, x])})
The main downside of #2 is that it takes more code, and the resulting
output is not named. However, it gives you all the flexibility you
need.
HTH,
Josh
Jun ? ? ? ?[[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.
Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/
Try this: lapply(mtcars, function(.)names(mtcars)[match.call()[[2]][[3]]])
On Fri, Apr 15, 2011 at 3:14 PM, Jun Shen <jun.shen.ut at gmail.com> wrote:
Dear list, I want to loop over a list through lapply and at the same time I want to extract some information from the names of the list elements. lapply does not seem to carry the names. Is there anyway to access the names of a list within lapply? Thanks. Jun ? ? ? ?[[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.
Henrique Dallazuanna Curitiba-Paran?-Brasil 25? 25' 40" S 49? 16' 22" O
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