On Tue, 11 Jul 2006, Prof Brian Ripley wrote: > On Fri, 7 Jul 2006, Thomas Lumley wrote:
> > On Fri, 7 Jul 2006, Martin Morgan wrote: [...] > > > More generally, perhaps as.vector might not duplicate when mode(x) == > > > mode ? > > > > This isn't a trivial change, because mode(x)==mode does not guarantee > > that as.vector(x, mode) has no effect. For example, with mode="numeric" it > > removes attributes. > > And with mode="list" it does not (although that is not as documented). > We can certainly do better. [This is another of those cases where 'mode' > is confusing, and in fact it would be typeof(x) == mode.] Aargh: of course I should have guessed that quite a few people have written code that assumes that e.g. as.double() duplicates. The first I came across is a .Fortran call in smooth.spline with DUP=FALSE which despite all the warnings changes its 'w' argument and hence the return result from smooth.spline if as.double is made more efficient. I really have no desire to spend any more time tracking down problems caused by such rogue code, so I am going to leave this as is (with as.list somewhat more efficient but the as.vector functions always duplicating). -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
