[R] grid packages since R-1.7.1

[Patrick Connolly]

On Thu, 04-Dec-2003 at 11:23PM -0600, Deepayan Sarkar wrote:

|> On Thursday 04 December 2003 21:19, Patrick Connolly wrote:

[...]

|> > options(defaultPackages =  c("mva", "lattice"), keep.source.pkgs = TRUE)
|> >
|> > It's rather unlikely that I should specifically load grid also, but
|> 

|> That's exactly what you need to do (i.e., load grid explicitly).
|> This has to do with namespaces, which makes some earlier notions
|> obsolete. lattice 'imports' grid function definitions but by itself
|> no longer makes them available/visible to the user.


I understand from that that there is functionality in grid that
lattice doesn't normally require and so isn't in what is 'imported' to
lattice.  Evidently, all the time I used R-1.8.0, I was not requiring
that functionality.

|> 
|> This of course doesn't explain any problems in grid.polygon after loading 
|> grid. grid.polygon has changed in 1.8.1, but I think it is supposed to be 
|> back-compatible. Could you provide a reproducible example ? 

My hunch was completely off course -- nothing to do with scoping.  I
tracked it down to a deficiency in the error messages in 1.7.1 which
proceded to go on with what it could do without complaining about what
it couldn't do (because of no data in some cases).  1.8.1 is more
up-front and bawks when it can't do what was asked.  I simply added an
if statement to avoid trying to do the impossible.

Thanks for helping me clear that up.


-- 
Patrick Connolly
HortResearch
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New Zealand 
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