Dear R-Helpers,
I am not very experienced in using lattice and I am still in the learning
stage

I have a data set which looks like this: (I have deleted a few lines in
order to save space)

   Chromosome marker Marker.Name Distance
1           1      1     PeMm261   0.0000
2           1      2       Xtxp8  10.1013
..
20          1     20     EbMi148 210.3099
21          1     21      Xtxp25 232.0118
22          2      1     EcMm152   0.0000
23          2      2     EeMp342   5.1474
...
36          2     15     EaMp217 124.5115
37          2     16     EaMp131 136.9033
....
40          3      1    TEak2908   0.0000
41          3      2     Xtxp303   4.7094
42          3      3     EhMm195  10.1694

(I have 11 chromosome in total .. so conditioning on chromosome gives me 11
panels)

This is a data.frame which contains Chromosome Number, Marker Number for
that chromosome and the corresponding Marker.Name and Distance.

I want to plot the genetic distance conditioned on chromosome and the marker
name listed below the distance where the marker is situated on chromosome
(something like this picture)

Panel 1 : Chromosome 1

|-------------------|-------------------------  (so and so forth)
PeMm261     Xtxp8
<---- 10.1013 ->  (the distance b/w these markers is same as the
corresponding value in marker$Distance - see 1 and 2 row in the sample
output)

and similarly for other chromosomes.


I tried:

plt1 = dotplot(  ~ Distance | Chromosome, data=marker,par.strip.text =
list(cex = 0.75), layout = c(1,11),
        lattice.options=list(legend="right"), xlab="Distance in cM",
ylab="",
        scales= list(cex=0.5),

        panel = function(x, y) {
           panel.grid(h=1,v= 345)
           panel.xyplot(x, y,pch=20,type="o",lwd="2",cex=1.5)
       },
)

update(plt1, main="Genetic Map",
  strip = strip.custom(factor.levels = c("1",
"2","3","4","5","6","7","8","9","10","11"), strip.levels = TRUE))


This gives me the location of markers on the respective chromosomes
corresponding to the distances in the above data.frame. The markers are just
shown as points.


MY QUESTIONS - 1) If I want to label these dots with the corresponding
marker names - How do I do that?
                             2) Is there a way in lattice - to know which
panel I am in.

I tried inserting panel.text in the panel function - but it doesn't like
that. (I also played around with scales - but without any success)

Any help will be greatly appreciated.

Thx,
S.

-------------------------------------------------------------------------------
> sessionInfo()
R version 2.9.1 (2009-06-26)
i386-pc-mingw32

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] lattice_0.17-25 qtl_1.14-2

loaded via a namespace (and not attached):
[1] grid_2.9.1  tools_2.9.1

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