[R] help with a special variant of balloonplot

[ravi]

Hi,
I am interested in implementing a special variant of
balloonplot.  Let me
explain with an example dataset from the reference manual :

library(gplots)
data(Titanic)
dframe<-as.data.frame(Titanic)
survived<-dframe[dframe$Survived=="Yes",]
attach(survived)
balloonplot(x=Class,y=list(Age,Sex),z=Freq,sort=TRUE,show.zeros=TRUE,cum.margins=FALSE,
            main="BalloonPlot : Surviving passengers") # standard 
plot
# Now comes the attempt at something more special
FreqThresh=50 # A threshold level
Freqdev<-Freq-FreqThresh # A new variable
colors=ifelse(Freqdev>0,"green","magenta") 
balloonplot(x=Class,y=list(Age,Sex),z=Freqdev,sort=TRUE,show.zeros=TRUE,cum.margins=FALSE,dotcol=colors,
show.margins=FALSE,main="BalloonPlot : Surviving passengers")
 
I am interested in a table with the
values unchanged from the titanic dataframe. These values should be highlighted
in balloons in two different colours, let’s say, green and magenta. For
positive values of Freqdev, the balloons will be green and have a size
depending on the magnitude of Freqdev. For negative values of Freqdev, the 
balloons
will have a colour of magenta and have a size proportional to the absolute
values of Freqdev.
I am not sure if a simple tweak can lead to a solution.

I will appreciate any help that I can get.
Thanks,
Ravi

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