R help - Nov 2012 - [lattice] how to label panels with variable value (not name)?

As described @

https://stat.ethz.ch/pipermail/r-help/2012-November/329442.html

I now know how to prepare my netCDF data specifying gas concentrations
over a 3D space (dimensions longitude, latitude, and (vertical) level),
so as to call lattice::levelplot() like

levelplot(conc ~ lon * lat | lev, data=data.frame)

which labels each panel in the lattice of plots with the name "lev"
plus
a graphical indicator of the level value. Alternatively, I can label
each panel with an index (i.e., "1", "2", ...) by calling

levelplot(conc ~ lon * lat | factor(lev), data=data.frame)

However I will need to before-and-after compare this to the results of a
reboxing, or 3D regridding, of this data, so I would prefer instead to
label each panel in the lattice with the _value_ of the level (an
atmospheric pressure), rather than the name or index of the level.
How to do that?

TIA, Tom Roche <Tom_Roche at pobox.com>

AFAICS, you will have to pre-compute the values and create a factor
with levels these values as character strings. Then use this factor as
the conditioning variable

?sprintf
?formatC
?round

and the like may be useful to format the numerical values suitably for
your labels.

Cheers,
Bert

On Sun, Nov 18, 2012 at 6:43 AM, Tom Roche <Tom_Roche at pobox.com>
wrote:
>
> As described @
>
> https://stat.ethz.ch/pipermail/r-help/2012-November/329442.html
>
> I now know how to prepare my netCDF data specifying gas concentrations
> over a 3D space (dimensions longitude, latitude, and (vertical) level),
> so as to call lattice::levelplot() like
>
> levelplot(conc ~ lon * lat | lev, data=data.frame)
>
> which labels each panel in the lattice of plots with the name
"lev" plus
> a graphical indicator of the level value. Alternatively, I can label
> each panel with an index (i.e., "1", "2", ...) by
calling
>
> levelplot(conc ~ lon * lat | factor(lev), data=data.frame)
>
> However I will need to before-and-after compare this to the results of a
> reboxing, or 3D regridding, of this data, so I would prefer instead to
> label each panel in the lattice with the _value_ of the level (an
> atmospheric pressure), rather than the name or index of the level.
> How to do that?
>
> TIA, Tom Roche <Tom_Roche at pobox.com>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.


-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

Tom Roche <Tom_Roche <at> pobox.com> writes:
> 
> 
> As described @
<<< clipped >>>
> 
> However I will need to before-and-after compare this to 
the results of a
> reboxing, or 3D regridding, of this data, so I would
 prefer instead to
> label each panel in the lattice with the _value_ of
 the level (an
> atmospheric pressure), rather than the name or 
index of the level.
> How to do that?
> 
> TIA, Tom Roche <Tom_Roche <at> pobox.com>
maybe, see ?strip.custom in lattice

-- 
Ken Knoblauch
Inserm U846
Stem-cell and Brain Research Institute
Department of Integrative Neurosciences
18 avenue du Doyen L?pine
69500 Bron
France
tel: +33 (0)4 72 91 34 77
fax: +33 (0)4 72 91 34 61
portable: +33 (0)6 84 10 64 10
http://www.sbri.fr/members/kenneth-knoblauch.html

https://stat.ethz.ch/pipermail/r-help/2012-November/329450.html
>> I [can now] prepare my netCDF data specifying gas concentrations over
>> a 3D space (dimensions longitude, latitude, and (vertical) level),
>> so as to call lattice::levelplot() like
>> levelplot(conc ~ lon * lat | lev, data=data.frame)
...
m
>> However I will need to [do before-and-after comparisons of that plot]
>> to the results of a reboxing, or 3D regridding, of this data[. Hence]
>> I would prefer instead to label each panel in the lattice with the
>> _value_ of [its] level (an atmospheric pressure), rather than [its]
>> name or index
https://stat.ethz.ch/pipermail/r-help/2012-November/329454.html
> see ?strip.custom in lattice
That showed me where to look in "the lattice book": see (partial)
solution to this problem, and the followup problem, @

https://stat.ethz.ch/pipermail/r-help/2012-November/329479.html

Thanks! Tom Roche <Tom_Roche at pobox.com>