[R] lattice fun: multiple themes in panels with spplot()

[Neil Best]

Now I have this:

trellis.par.set( peelTheme)
plot( spplot( thumbDf, "pri",
             main= "Primary cover",
             mapasp = "iso",
             colorkey= FALSE), 
     panel.width= list( x=0.6, units= "npc"),
     split= c( 1, 1, 3, 1), 
     position= c( 0, 0.2, 1, 0.8),
     more= TRUE)
plot( spplot( thumbDf, "sec",
             main= "Secondary cover",
             mapasp = "iso",
             colorkey= list( space= "right")), 
     panel.width= list( x=0.6, units= "npc"),
     split= c( 2, 1, 3, 1), 
     position= c( 0, 0.2, 1, 0.8),
     more= TRUE)
trellis.par.set( seqTheme)
plot( spplot( thumbDf, "pct",
             main= "Classification confidence, %",
             mapasp = "iso",             
             at= seq( 0, 100, by= 5),
             cuts= 5), 
     panel.width= list( x=0.6, units= "npc"),
     position= c( 0, 0.2, 1, 0.8),
     split= c( 3, 1, 3, 1))

The panels are the same size, but I'm not sure I understand what is going on
and have a suspicion that there must be a better way that is more generally
applicable without having to fiddle with so many constants.  It's not clear
that the mapasp= arguments have any effect and I don't really understand the
implication of its default for spplot() for geographic data (which is what I
am plotting) in light of the note in the man page of plot.trellis that for
panel.width and panel.height.  It says that "[these options] should not be
used in conjunction with non-default values of the aspect argument in the
original high level call (no error will be produced, but the resulting
behaviour is undefined)."



-----
Neil Best
Computation Institute
University of Chicago
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