On Tue, 23 Nov 2004, Roger D. Peng wrote:
I noticed the following today --- str() seems to remove any extra class information added to an environment.
[1] "environment"e <- new.env() class(e)[1] "foo" "environment"class(e) <- c("foo", class(e)) class(e)str(e)Classes 'foo', 'environment' length 0 <environment>class(e)[1] "environment"
I'm not sure if this is related to the external pointer issue mentioned in the NEWS file.
It is. Needed essentially the same fix.
Is this the intended behavior for environments? (It happens in today's R-devel also.)
I believe the intention is that you should not class environments. Luke suggested earlier that unclassing one be made an error, and I have now done that. Note that environments are not copied, and so everything you do to one instance you do to all other instances of it. Setting a class makes little sense for such an object.
-- 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
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