On Thu, May 14, 2009 at 12:16 PM, Lori Simpson <lori.simp...@dc-energy.com> wrote: > I am writing a custom function that uses an R-function from the > reshape package: cast. However, my question could be applicable to > any R function. > > Normally one writes the arguments directly into a function, e.g.: > > result=cast(table1, column1 + column2 + column3 ~ column4, > mean) (1) > > I need to be able to write this statement as follows: > > result=cast(table1, string_with_columns ~ column4, mean) (2) > string_with_columns = group of functions that ultimately outputs: > "column1 + column2 + column3"
It's complex in general, but for cast you can just supply a string: cast(table, paste(string_with_columns, "~ column4")) Hadley -- http://had.co.nz/ ______________________________________________ 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.
