hi duncan, thanks a lot for your help!

yes, your solution is working fine with a little tweaking of the vector 
"poscec" : but on the other hand it's just affecting the relative 
position of labels around respective points;
to get more flexibility would be probably better to supply  (even if I 
do not know exactly how) a set of coordinates for respective labels via 
the parameters "x" and  "y" or maybe just changing the position of some 
specific labels remaing the rest unaltered
can you think to a viable solution for this approach?
I've been trying that but for reasons I do not fully understand I can't 
make it work

thanks again for your valuable help

Massimo Bressan

ARPAV
Environmental Protection Agency of Veneto Region - Italy
Department of Treviso
31100 Treviso, Italy




Il 27/02/2013 23:38, Duncan Mackay-2 [via R] ha scritto:
> hi
>
> the bottom panel seems ok so for the top you
> supply a vector of positions that are your
> required positions (name eg posvec) to the panel
> function. may need to do the same for other functions
> to access the correct panel there is the ifelse statement
>
> posvec = c(...)
>
>    panel = function(x, y , subscripts,...) {
>            pnl = panel.number()
>            panel.xyplot(x, y, cex=0.8,...)
>            panel.abline(a = 0, b = 1, lty = 2, col ="gray")
>            if (pnl == 2){
>            panel.text(x, y, labels=tv.ms$inq[subscripts],
>                       cex = 0.7, pos=3, offset=1, srt=0, adj=c(1,1))
>            } else {
>            panel.text(x, y, labels=tv.ms$inq[subscripts],
>                       cex = 0.7, pos=posvec, offset=1, srt=0, adj=c(1,1))
>            }
>            #alternative to the use of panel.text
>            #ltext(x=x, y=y, labels=tv.ms$inq[subscripts], pos=1, cex=0.8)
>          },
>
> HTh
>
> Duncan
>
> Duncan Mackay
> Department of Agronomy and Soil Science
> University of New England
> Armidale NSW 2351
> Email: home: [hidden email] 
> </user/SendEmail.jtp?type=node&node=4659841&i=0>
>
>
> At 22:30 27/02/2013, you wrote:
>
> >This is my reproducible example
> >tv.ms<-structure(list(inq = structure(4:17,
> >.Label = c("D4", "D5", "D6a", "D6b", "D6c",
> >"D7", "D8", "F4", "F5a", "F5b", "F6a", "F6b",
> >"F6c", "F6d", "F7a", "F7b", "F8"), class =
> >"factor"), tv.km.median.iteq =
> >c(0.320000000000004, 0.239999999999998,
> >0.240000000000002, 0.0800000000000001,
> >0.989999999999995, 0.309999999999999,
> >4.47000000000003, 0.620000000000005,
> >0.620000000000005, 0.18, 0.790000000000006,
> >0.32, 0.0200000000000005, 0.01),
> >ms.km.median.iteq = c(0.420000000000002,
> >0.380000000000001, 0.33, 0.0900000000000001,
> >1.06999999999994, 0.559999999999974,
> >5.20000000000027, 1.5, 1.19, 0.469999999999999,
> >0.310000000000002, 0.459999999999999,
> >0.0400000000000003, 0.04 ), type = c("PCDD",
> >"PCDD", "PCDD", "PCDD", "PCDF", "PCDF", "PCDF",
> >"PCDF", "PCDF", "PCDF", "PCDF", "PCDF", "PCDF",
> >"PCDF")), .Names = c("inq", "tv.km.median.iteq",
> >"ms.km.median.iteq", "type"), row.names = 4:17,
> >class = "data.frame") I worked out the chart
> >mainly with the hints of this great forum
> >(thanks again for that): what Iâve done so far
> >accomplishes my needs except for that now I need
> >a little final tweaking in order to avoid the
> >overlapping of some specific labels (i.e. by
> >looking at the plot the labels: F6b and F6a, F7a
> >and F5a)
> >xyplot(tv.km.median.iteq~ms.km.median.iteq|type,
> >data=tv.ms,         layout=c(1,2),
> >aspect="xy",         xlab = expression(paste('ms
> >[ fg/', m^3, ' ]', sep = '')),         ylab =
> >expression(paste('tv [ fg/', m^3, ' ]', sep =
> >'')),         scales= list(relation="free",
> >log=10, cex=0.8),                prepanel =
> >function(x, y, subscripts) {           rr<-
> >range(cbind(x,y))           list(xlim = rr,
> >ylim= rr)         },         panel = function(x,
> >y , subscripts,...) {           panel.xyplot(x,
> >y, cex=0.8,...)           panel.abline(a = 0, b
> >= 1, lty = 2, col
> >="gray")           panel.text(x, y,
> >labels=tv.ms$inq[subscripts],
> >cex = 0.7, pos=3, offset=1, srt=0,
> >adj=c(1,1))           #alternative to the use of
> >panel.text           #ltext(x=x, y=y,
> >labels=tv.ms$inq[subscripts], pos=1,
> >cex=0.8)         },         #subscripts=TRUE,
> >      xscale.components =
> >function(...)  {           ans <-
> >xscale.components.logpower(...)           range
> ><- ans$num.limit           newtck <-
> >round(seq(range[1],range[2],l=7),1)
> >ans$bottom$ticks$at <-
> >newtck           ans$bottom$labels$at <-
> >newtck           ans$bottom$labels$labels
> ><-parse(text=paste('10^',newtck,sep=''))
> >ans         } ,         yscale.components  =
> >function(...)  {           ans <-
> >yscale.components.logpower(...)           range
> ><- ans$num.limit           newtck <-
> >round(seq(range[1],range[2],l=7),1)
> >ans$left$ticks$at <-
> >newtck           ans$left$labels$at <-
> >newtck           ans$left$labels$labels
> ><-parse(text=paste('10^',newtck,sep=''))
> >ans         } ) Iâm thinking to sort out the
> >problem by: 1 -       plotting all labels except
> >for those overlapping (i.e the above mentioned
> >points); 2 -  plotting the remaining labels
> >(i.e. the overlapping ones) by introducing a
> >âmanual displacementâ; I know thatâs
> >probably not much efficient nor elegant
> >resorting to a âmanual solutionâ involving
> >at least two âplotting stepsâ (the first to
> >see where to tweak and the second to fix) but I
> >canât think to any other solution Any help?
> >Thank you max -- View this message in context:
> >http://r.789695.n4.nabble.com/lattice-xyplot-point-labelling-tp4659798.html 
>
> >Sent from the R help mailing list archive at
> >Nabble.com.
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