R help - May 2012 - Coloring subsets of points of a strip chart by quantiles

Hello All,

I am trying to color five subsets of points in a series of vertical strip
charts by quintiles using the quantile function, but I have not been able to
do this successfully, nor have I been able to find an example of this
online.  I would like to have the "E1", "E2", and
"E3" columns plotted on a
single plot (containing the three strip charts).  I am overlaying the strip
chart over a transparent background box plot.

##OK, here's some data (This is probably an inelegant way to do this, but
I'm obviously new to R):

mdat <-
matrix(c(round(runif(14,min=50,max=100)),round(runif(14,min=50,max=100)),round(runif(14,min=50,max=100))),
nrow = 14, ncol=3, byrow=F,dimnames = list(c(seq(1,14,by=1)),c("E1",
"E2",
"E3"))) ; mdat <- as.data.frame(mdat)

mdat

   E1 E2  E3
1  72 96  95
2  56 81  85
3  57 55  95
4  72 83  89
5  61 65  51
6  80 86  85
7  99 85 100
8  50 98  60
9  79 54  63
10 81 58  96
11 60 74  52
12 56 51  80
13 65 51  75
14 90 88  65

boxplot(mdat, col="transparent", main="mdat", boxwex = 0.25,
ylab="Score",
cex=2, cex.axis=2, cex.lab=1.5, cex.main=2, las=1, col.main="blue",
col.lab="blue", col.axis="blue")

stripchart(mdat,vertical=T, col="blue", method="stack",
pch=21,cex=2, add=T,
bg= rainbow(quantile(mdat, prob = c(.2, .4, .6, .8, 1), na.rm T),alpha=0.5))

##Here's the plot, but I don't think that the coloring is behaving as I
would like. (1) I don't think that the quantile function is getting applied
to each "E1/2/3" separately. (2) I don't think that the data is
getting
"cut" and colored by (five) ranges that depend upon the quintiles.

Any help would be appreciated.  Thanks.
http://r.789695.n4.nabble.com/file/n4624535/mdat.png 

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