To plot a correlation matrix on a graph, you can use the lattice package as follows:
To create the information for the horizontal and vertical axis.
library(lattice)
hori <- c("214", "215", "216", "224", "211", "212", "213", "223", "226", "225")
vert <- paste("DM1-", hori, sep="")
To build a dummy correlation matrix
nrowcol <- length(vert)
cor <- matrix(runif(nrowcol*nrowcol, min=0.4), nrow=nrowcol, ncol=nrowcol, dimnames = list(hori, vert))
for (i in 1:nrowcol) cor[i,i] = 1
To plot the matrix
rgb.palette <- colorRampPalette(c("blue", "yellow"), space = "rgb")
levelplot(cor, main="stage 12-14 array correlation matrix", xlab="", ylab="", col.regions=rgb.palette(120), cuts=100, at=seq(0,1,0.01))
Output: