On Wed, Mar 10, 2010 at 7:50 PM, Thomas Lumley <tlum...@u.washington.edu> wrote: > On Wed, 10 Mar 2010, baptiste auguie wrote: > >> Hi, >> >> it's generally considered a bad practice but try this, >> >> eval(parse(text=AA)) >> >> library(fortunes) >> fortune(106) >> >> HTH, >> >> baptiste >> >> On 10 March 2010 07:46, jq81 <jingqia...@gmail.com> wrote: >>> >>> My question is represented by the following example. >>> >>> For example, I have a character string a, which is defined as >>> >>> AA="list(x=1, y=2)" >>> >>> I want to take out the content of AA by using some function, so that I >>> can >>> obtain the following expression automatically. >>> >>> list(x=1, y=2) >>> > > This is the situation where it isn't considered bad practice. If someone > hands you a string with code in it, the only way to parse it is with > parse().
I think that Is there another way: source(textConnection(AA))$value closeAllConnections() > The problem with eval(parse()) is when people use it to do macro processing > or other things that are much better done with expressions. > > -thomas > > Thomas Lumley Assoc. Professor, Biostatistics > tlum...@u.washington.edu University of Washington, Seattle > > ______________________________________________ > 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.
