David, Peter (and others), If you're interested, I submitted this as a bug, and was informed of the error of my ways by Professor Ripley * His informative reply is copied below. *
The short answer is that panel.first is not a documented function of "plot.formula", which is called by the generic "plot". The solution gives me some insight into how the lazy evaluation works. ## Note: It's still not a documented use of the function! plot(y ~ x, data=dat, panel.first=quote(bgfun())) On Wed, May 25, 2011 at 2:13 AM, <r-b...@r-project.org> wrote: https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=14591 Brian Ripley <rip...@stats.ox.ac.uk> changed: What |Removed |Added ------------------------------ > > ---------------------------------------------- > Status|NEW |CLOSED > Resolution| |INVALID > > --- Comment #1 from Brian Ripley <rip...@stats.ox.ac.uk> 2011-05-25 > 03:13:34 EDT --- > panel.first is not a documented argument to plot.formula: please do > read the help. It is a documented argument to plot.default(), as > > panel.first: an expression to be evaluated after the plot axes are set > ^^^^^^^^^^ > but you passed an evaluated function call. It first ran bgfun() and then > the > plot call. It worked for plot.default() by lazy evaluation. > > You needed > > plot(y ~ x, data=dat, panel.first=quote(bgfun())) [[alternative HTML version deleted]] ______________________________________________ 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.
