Re: [Rd] The Depends: field of a package is now used by library()

From: Prof Brian Ripley <>
Date: Fri 13 Aug 2004 - 01:19:12 EST

On Thu, 12 Aug 2004, Deepayan Sarkar wrote:

> On Thursday 12 August 2004 07:34, Prof Brian Ripley wrote:
> > In R-devel, the Depends: field in the DESCRIPTION file is now used by
> > library() to load the named packages before the current package, and
> > also to set up the environment to save images and prepare for lazy
> > loading.
> How would this relate to namespaces? For instance, lattice imports grid
> (and a few things from stats and graphics). If I keep grid in the
> depends field, loading lattice does a require(grid), which defeats one
> of the purposes of having namespaces. If I leave it out, nothing bad
> seems to happen as long as grid is installed, but there should be some
> indication in the DESCRIPTION that that grid is a requirement. None of
> the other fields seem appropriate.

It's a grey area. As all copies of R that you are using will have grid, leave it out of Depends: for lattice.

Perhaps we need to invent another field such as UsesNamespaces?


Brian D. Ripley,        
Professor of Applied Statistics,
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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