FW: [R] boxplot grouped by two variables: general issue
ihaka at stat.auckland.ac.nz
Thu Nov 23 21:06:35 CET 2000
On Thu, Nov 23, 2000 at 12:07:55PM +0100, Jens Oehlschlägel wrote:
> Here are my questions:
> a) Any plans to implement trellis?
Yes, in fact work is in progress. Paul Murrell is working on
generalized layout facilities which will provide the necessary
support for multipanel conditioning (and more). It is probably
premature to talk about a time frame for this, but can report
that I have seen trellis-like plots on Paul's screen.
Of course, layout support is just the low-level part of trellis,
but I think the higher level parts could come comparatively
quickly once the layout support is in place. (Issues are things
like shingles and banking).
> b) Are there any other solutions in R which offer simple trellis
Deepayan Sarkar has been working on modifications to coplot
to make it more trellis-like. This could well be placed over
Paul's layout code at some point.
> c) Do you think, attacking these problems leads to reinventing trellis with
> all it's complexity?
> If the answers turn out to be c(a=NO,b=NO,c=NO) I would like to ask in more
> Is it possible to write plot functions to properly behave as high level AND
> as panel functions?
I want to look issues like this. Some kind of partitioning of
functionality is clearly needed. It should be possible to
access plots at a variety of levels
(i) High level,
(ii) Purely computational (no plotting).
Some methods accept a plot=FALSE argument.
In addition, it seems like we need:
(iii) an intermediate level which allows the embedding
of plots within other plots.
Examples of this last are trellis panels and panels of plots
superimposed on maps.
> Are there any issues that NEED to be addressed beyond 1) to 3) ?
> Any recommendations? Any related work in progress? Any volunteers?
A useful contribution would be a look at how to package the
functionality of the higher levels of trellis. There are general
issues of compatibility and extension, as well as specific
functionality that needs to be provided. The "for the record"
sections of Cleveland's latest book are a good source for
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