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...a new)? Very serious people have taken part in the debates so far. I hope to let you know of the places I came by, so you might be able to follow/participate in these (IMHO) important discussions. The discussions started in the response for the following blog post on Xi'An's blog: http://xianblog.wordpress.com/2010/09/06/insane/ Followed by the (short) response post by Ross Ihaka: http://xianblog.wordpress.com/2010/09/13/simply-start-over-and-build-something-better/ Other discussions started to appear on Andrew Gelman's blog: http://www.stat.columbia.edu/~cook/movabletype/archives/2010/...

Dear List Is there a package for leapfrog plotting (Hamiltonian Monte Carlo estimation) in R? I tried the actual "LEAPFrOG" package which doesn't actually give the plot like this one? http://xianblog.files.wordpress.com/2010/09/hamilton.jpg How doe one plot this in R? So, there semi-circle and dots on that semi-circle. I don't think curve() or plot() would produce such plot. Thanks in advance! [[alternative HTML version deleted]]

When complex assignments are performed, the R interpreter creates, then removes a special variable *tmp*. However, when byte compiling is enabled, it seems that a different mechanism for making compound assignments is used. Would it be possible to eliminate *tmp* from interpreted R code as well? It might be useful for a function to lock its own environment, and the appearance and disappearance of