dotplot as a background for multiple barchart plots (with Lattice)

Thu, Apr 7, 2011 9:12 PM

On Thu, Apr 7, 2011 at 7:16 PM, Christian Charles

<christian.charles at inrialpes.fr> wrote:

Hi R users,

I'm kind stuck in my R experience...
I want to have a multiple barchart with n windows, but with the same
background for each window, and I want that background to be a recorded
dotplot.
First, is it possible ?
If so, I guess I have to call a record plot in the panel function but how ?
As there is no panel.plot and I can't use the recorded plot as an argument
for the panel.dotplot() call, I'm stuck.
I think I close but I need some help.

Many thanks and regards,

Christian


### dummy data building
test <- data.frame(Subject=rep(c("A", "B", "C", "D"), each=6),
? ? ? ? ? ? ? ? ? Type=rep(c("EEE", "FFF", "GGG", "HHH", "III", "JJJ"),
times=4),
? ? ? ? ? ? ? ? ? MeanX=abs(rnorm(24)),
? ? ? ? ? ? ? ? ? MeanZ=abs(rnorm(24)))

### data for regrouping all means
all <- data.frame(Type=levels(factor(test$Type)), MeanX = c(0), MeanZ =
c(0))

### building means...
for(s in levels(factor(test$Subject)))
{
? ?tmp <- data.frame(Type = all$Type)
? ?for(t in tmp$Type)
? ?{
? ? ? ? ? ?tmp$MeanX[tmp$Type == t] <- mean(test$MeanX[test$Type==t &
test$Subject==s])
? ? ? ? ? ?tmp$MeanZ[tmp$Type == t] <- mean(test$MeanZ[test$Type==t &
test$Subject==s])
? ?}
? ?all$MeanX = all$MeanX + tmp$MeanX
? ?all$MeanZ = all$MeanZ + tmp$MeanZ
}
l <- length(levels(factor(test$Subject)))
all$MeanX = all$MeanX/l
all$MeanX = all$MeanZ/l

### plot for means
meanplot <- dotplot(MeanX+MeanZ ~ Type, data=all, cex = 1.2, xlab="",
ylab="",
? ?panel = panel.superpose,
? ?panel.groups = function(x, ..., group.number){
? ?panel.dotplot(x + (group.number - 1.5)/3, ... )
? ?})

### test plot in order to see if there is something wrong.
plot(meanplot)

### final plot
barchart( ? ?MeanX + MeanZ ~ Type|Subject,
? ? ? ? data=test ,
? ? ? ? scales = list(x = list(rot = 60)),
? ? ? ? layout=c(1, l),
? ? ? ? panel = function(...) {
? ? ? ? ? ?panel.superpose
? ? ? ? ? ?#panel.dotplot(meanplot) # so this is want I want, my recorded
dotplot as a background...
? ? ? ? ? ?panel.abline(h=0)
? ? ? ? ? ?panel.grid(v = -length(levels(factor(test$Type))), h=0)
? ? ? ? ? ? panel.barchart(...)
? ? ? ? ? ?})

Here is a literal solution (plot the 'meanplot' object in each panel):

barchart(MeanX + MeanZ ~ Type|Subject,
         data=test ,
         scales = list(x = list(rot = 60)),
         layout=c(1, l),
         panel = function(...) {
             plot(meanplot, newpage = FALSE)
             panel.abline(h=0)
             panel.grid(v = -length(levels(factor(test$Type))), h=0)
             panel.barchart(...)
         })

but a better solution may be to draw just the panel part (which
doesn't work very well because the y-limits are different).

barchart(MeanX + MeanZ ~ Type | Subject,
         data=test ,
         scales = list(x = list(rot = 60)),
         layout=c(1, l),
         panel = function(...) {
             mpargs <- trellis.panelArgs(meanplot, 1)
             do.call(meanplot$panel, mpargs)
             panel.abline(h=0)
             panel.grid(v = -length(levels(factor(test$Type))), h=0)
             panel.barchart(...)
         })

-Deepayan

dotplot as a background for multiple barchart plots (with Lattice)

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