[Rd] Mosaicplot coloring (PR#8537)

[greg.kochanski@phon.ox.ac.uk]

Full_Name: Greg Kochanski
Version: 2.2.1
OS: Debian Linux (testing)
Submission from: (NULL) (212.159.16.190)


mosaicplot(x, shade=TRUE) is intended to color the blocks
blue if they are more common than one might expect
and red if they are rarer than one might expect.

Unfortunately, if a block is much rarer than expected,
it is so narrow that one cannot see the red.    Thus,
a casual inspection of the mosaicplot will miss some
of the most statistically significant results.

This is partially an intrinsic problem and cannot be
entirely fixed, but it is made worse by the black outlines
around each block.    Blocks with very small probabilities
show as black, not red.   The broken outlines on the
red blocks help, but not quite enough.

I would suggest that there be an option to either turn off
the black outlines when for the colored blocks,
or an option to use colored outlines.

If those options are somehow hidden in the ... part of the
argument list for mosaicplot(), I apologize, but then this
bug report should be converted to a documentation bug.
Nowhere in help(mosaicplot) does it say what one can put into
the unspecified arguments (...).