[R] lattice dotplot reorder contiguous levels

[maxbre]

my reproducible example

test<-structure(list(site = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 
3L, 3L, 3L, 3L, 3L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 
4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 5L), .Label = c("A", 
"B", "C", "D", "E"), class = "factor"), conc = c(2.32, 0.902, 
0.468, 5.51, 1.49, 0.532, 0.72, 0.956, 0.887, 20, 30, 2.12, 0.442, 
10, 50, 110, 3.36, 2.41, 20, 70, 3610, 100, 4.79, 20, 0.0315, 
30, 60, 1, 3.37, 80, 1.21, 0.302, 0.728, 1.29, 30, 40, 90, 30, 
0.697, 6.25, 0.576, 0.335, 20, 10, 620, 40, 9.98, 4.76, 2.61, 
3.39, 20, 4.59), samp.time = structure(c(2L, 4L, 4L, 4L, 4L, 
4L, 5L, 4L, 8L, 8L, 8L, 8L, 8L, 9L, 8L, 7L, 8L, 8L, 8L, 8L, 3L, 
3L, 2L, 4L, 4L, 4L, 4L, 4L, 1L, 4L, 6L, 4L, 8L, 4L, 8L, 4L, 3L, 
8L, 4L, 8L, 4L, 8L, 4L, 9L, 3L, 8L, 8L, 8L, 8L, 8L, 8L, 1L), .Label = c("2", 
"4", "12", "24", "96", "135", "167", "168", "169"), class = "factor")),
.Names = c("site", 
"conc", "samp.time"), row.names = c(NA, 52L), class = "data.frame")



dotplot(samp.time~conc|site, data=test,
        scales=list(x=list(log=10), y = list(relation = "free")),
        layout=c(1,5), strip=FALSE, strip.left=TRUE
        )


my objective is to use “site” as conditioning variable but with “samp.time”
correctly grouped by “site”; the problem here is to ensure that levels of
“samp.time” within each “site” are contiguous as otherwise they would be not
contiguous in the dot plot itself (i.e, avoid that sort of holes in between
y axis categories -see dotplot -)


I’ve been trying with this but without much success

test$samp.time.new<-
  with(test,reorder(samp.time,as.numeric(site)))


dotplot(samp.time.new~conc|site, data=test,
        scales=list(x=list(log=10), y = list(relation = "free")),
        layout=c(1,5), strip=FALSE, strip.left=TRUE
        )

I think (I hope) a possible different solution is to create for "ylim" a
proper character vector of different length to pass to each panel of the
dotplot (I’m not posting this attempt because too much confused up to now)

can anyone point me in the right direction?
any help much appreciated

thank you




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