[R] how to add a vertical line for each panel in a lattice dotplot with log scale?

[maxbre]

thanks kimmo

I managed to get the desired result by first plotting the medians and then
adding the means through the user defind function posted in thread you
mentioned (here it is
http://r.789695.n4.nabble.com/Adding-mean-line-to-a-lattice-density-plot-td4455770.html#a4456502)

# start

dotplot(variety ~ yield | site, data = barley,
        scales=list(x=list(log=TRUE)),
        layout = c(1,6),
        panel = function(x,y,...) {
          panel.dotplot(x,y,...)
          median.values <- median(x)
          panel.abline(v=median.values, col.line="red") 
          }) 

addLine<- function(a=NULL, b=NULL, v = NULL, h = NULL, ..., once=F) { 
  tcL <- trellis.currentLayout() 
  k<-0 
  for(i in 1:nrow(tcL)) 
    for(j in 1:ncol(tcL)) 
      if (tcL[i,j] > 0) { 
        k<-k+1 
        trellis.focus("panel", j, i, highlight = FALSE) 
        if (once) panel.abline(a=a[k], b=b[k], v=v[k], h=h[k], ...) else 
          panel.abline(a=a, b=b, v=v, h=h, ...) 
        trellis.unfocus() 
      } 
}

mean.values<-tapply(barley$yield, barley$site, mean)

addLine(v=log10(mean.values), once=TRUE, col="blue", lty="dotted")

# end

but back to my previous question I still not understand why the plot of
medians is working fine BUT NOT of the means (apparently messing up panel
positions and also values): no clue for this!

I've been trying also with the use of layout() in latticeExtra but without
results...

anyone can clarify me these (strange for me) issues?

max
 



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