Re: [R] use of NULL environment is deprecated?

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Wed 12 Jul 2006 - 08:41:11 EST

On 7/11/2006 6:27 PM, Patrick Connolly wrote:
> ]> version
> _
> platform x86_64-unknown-linux-gnu
> arch x86_64
> os linux-gnu
> system x86_64, linux-gnu
> status
> major 2
> minor 3.1
> year 2006
> month 06
> day 01
> svn rev 38247
> language R
> version.string Version 2.3.1 (2006-06-01)
>
>
> I see in the NEWS file the line:
> o Use of NULL as an environment is deprecated and gives a warning.
>
> Which duly happens. I get warnings like this:

>> Warning message:

> use of NULL environment is deprecated
>
> My problem is that I don't know what is being referred to. A little
> birdie tells me that in later versions of R, those warnings will
> become errors so I need to work out where they're coming from before I
> can use later versions.
>
> My question is: How does one work out which is being referred to by
> such a message? The traceback() function is useful when failure
> occurs. Is there an analagous way of looking into warnings?

options(warn=2) will convert warnings into errors, so traceback will work.

A common situation where I've seen that error is with binary saves from earlier versions of R being loaded into current versions. For example, if you installed a package before, but didn't re-install it with 2.3.1, or if you are reloading a workspace saved in an earlier version.

Duncan Murdoch



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