Hello Dimitris thanks for this. It works! I guess I was fixated on the dollar sign.
I must confess that I don't really understand any of the error messages below. Can anyone help me interpret them? rksh Dimitris Rizopoulos wrote:
do you mean: f <- factor(c("pigs", "pigs", "slugs")) jj <- list(pigs = 1:10, slugs = 1:3) jj[levels(f)[1]] jj[[levels(f)[1]]] Best, Dimitris Robin Hankin wrote:Hi I have a factor 'f' and a named list 'jj'. I want names(jj) to match up with levels(f). How do I use levels(f) to access elements of jj? > f <- factor(c("pigs","pigs","slugs")) > f [1] pigs pigs slugs Levels: pigs slugs > > jj <- list(pigs=1:10,slugs=1:3) My attempts to produce jj$pigs all give errors: > jj$levels(f)[1] Error: attempt to apply non-function > do.call("$",jj,levels(f)[1]) Error in if (quote) { : argument is not interpretable as logical > "$"(jj,levels(f)[1]) Error in jj$levels(f)[1] : invalid subscript type 'language'
-- Robin K. S. Hankin Uncertainty Analyst University of Cambridge 19 Silver Street Cambridge CB3 9EP 01223-764877 ______________________________________________ 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.
