[R] Summary: recursion over list

Thomas Lumley tlumley at u.washington.edu
Thu Jun 13 18:09:10 CEST 2002

On Thu, 13 Jun 2002, Eric Lecoutre wrote:
> - Thomas Lumley proposes a version that allows to do the same job without
> having to flatten the list:
> 	treeapply<-function (x, FUN)
> 	{
> 	if (is.atomic(x))  	FUN(x)
> 		else lapply(x, function(n) treeapply(n, FUN))
> 	}
> Once again, all elements are not handled: I am considering any possible
> list: a list containing a function would not be handled.

though the revised version I posted a few hours later allowed the user to
specify a function that detected terminal nodes.  This *can't* be
completely generic, as it's quite possible that the terminal nodes could
in fact be lists (eg if they are objects).


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