On Mon, Jun 21, 2010 at 6:58 AM, Thaler, Thorn, LAUSANNE, Applied Mathematics <thorn.tha...@rdls.nestle.com> wrote: > Thanks, works as expected. But maybe I've to be a bit more clear about the > reason why I'd like to have such a construct. > > In lattice you can define some parameters by passing a named list to > par.settings. Suppose I want to superpose two lines and use colors different > from the default: > > xyplot(1:10~c(1:5,1:5), type="o", groups=rep(1:2,each=5), > par.settings=list(superpose.line=list(col=1:2), > superpose.symbol=list(col=1:2))) > > I have to specify the same setting for superpose.line and superpose.symbol. > If I'd use your proposition, I've to hardcode the respective item names. It > is still an academic question, for there are thousands of ways to solve this > issue, but I was just curious whether it is possible to find an one-liner > without the need of specifying any temp variable. >
Try this variation of my.transform that I had posted here: http://tolstoy.newcastle.edu.au/R/e2/help/07/09/24707.html List <- function(..., L = list()) { f <- function(){} formals(f) <- eval(substitute(as.pairlist(c(alist(...), L)))) body(f) <- substitute(modifyList(L, list(...))) f() } xyplot(1:10~c(1:5,1:5), type = "o", groups = rep(1:2,each=5), par.settings = List( superpose.line = list(col = 1:2), superpose.symbol = superpose.line)) ______________________________________________ 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.
