In R versions 2.10.1 and "2.11.0 Under development (unstable) (2010-03-07 r51225)" on Windows I get the following if I type the commands at the start of the session. Note how the attribute attached to the name "Response" by the initial call to structure() seems to get tied to that name for the remainder of the session:
> z <- structure(quote(Response), isResponse=TRUE) > parse(text="Response~Predictor")[[1]][[2]] Response attr(,"isResponse") [1] TRUE > quote(Response~Predictor)[[2]] Response attr(,"isResponse") [1] TRUE > quote(Response) Response attr(,"isResponse") [1] TRUE The attribute actually does go away after quite a while, but I haven't figured out the trigger. rm(z) followed by gc() does not affect it. If I use an unadorned variable called Response before making the structure z, then the isResponse attribute doesn't seem to stick to the name Response. Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
