[R] dotplot (lattice) with panel.segments and groups

Sebastian Luque spluque at gmail.com
Sun Jul 9 06:31:55 CEST 2006

"Gabor Grothendieck" <ggrothendieck at gmail.com> wrote:

On 7/7/06, Deepayan Sarkar <deepayan.sarkar at gmail.com> wrote:

> On 7/7/06, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
>>> Could you explain what panel.groups= does and what the difference
>>> is between panel.groups= and panel= ?  In ?xyplot it just says:

>>> panel.groups: useful mostly for 'xyplot' and 'densityplot'. Applies
>>> when 'panel' is 'panel.superpose' (which happens by default
>>> in these cases if 'groups' is non-null)

>>> which indicates when it might apply but not what it does.

>> That's wrong (it used to be right - a good example of why \synopsis is
>> bad). Since lattice 0.13-x, panel.superpose is never the default panel
>> function. An updated version with improved documentation should be out
>> soon.

>> 'panel.groups' is simply an argument to panel.superpose, and is
>> described in ?panel.superpose. Thus, it only makes sense as an
>> argument to xyplot/dotplot/whatever when the panel function is
>> panel.superpose, and not otherwise. The entry for the graphical
>> parameters in ?panel.superpose isn't as useful as it could be, I have
>> just updated it to read:

>> col, col.line, col.symbol, pch, cex, fill, font, fontface,
>> fontfamily, lty, lwd, alpha: graphical
>> parameters, replicated to be as long as the number of
>> groups.  These are eventually passed down to 'panel.groups',
>> but as scalars rather than vectors.  When 'panel.groups' is
>> called for the i-th level of 'groups', the corresponding
>> element of each graphical parameter is passed to it.

>> Hope that makes things a bit clearer.

Thanks Gabor and Deepayan for your responses.



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