On Tue, 13 Jun 2006, Duncan Murdoch wrote:
[...]
> However, it appears that you can only import packages that have a namespace.
> (I was unaware of this restriction; perhaps it's not really true, and the
> error message means something else.)
Yes, it is true but not properly documented. The description in R-exts is
All packages implicitly import the base name space. Variables from
other packages need to be imported explicitly using the directives
@code{import} and @code{importFrom}. The @code{import} directive
imports all exported variables from the specified package(s). Thus the
directives
and that needs to be qualified in at least two ways:
- all packages with namespaces implicitly import the base name space.
- Variables from other packages with a namespace ...
as the concept of `exported variables' only applied to a namespaces.
The terminology is also a little confusing: we have
importFrom(foo, f, g)
specifies that the exported variables @code{f} and @code{g} of the
package @pkg{foo} are to be imported.
^^^^^^^
but the error message is of the form
Error in importIntoEnv(impenv, impnames, ns, impvars) :
object 'print.summary.lm' is not exported by 'namespace:stats'
^^^^^^^^^
--
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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