R pairs plot

RR <- matrix(rnorm(50), 10, 5)
panel.hist <- function(x, ...)
{ usr <- par("usr"); on.exit(par(usr))
par(usr = c(usr[1:2], 0, 1.5) )
h <- hist(x, plot = FALSE)
breaks <- h$breaks; nB <- length(breaks)
y <- h$counts; y <- y/max(y)
rect(breaks[-nB], 0, breaks[-1], y, col="cyan", ...)
}
panel.blank <- function(x, y)
{ }
panel.cor <- function(x, y, digits=2, prefix="", cex.cor)
{
usr <- par("usr"); on.exit(par(usr))
par(usr = c(0, 1, 0, 1))
r <- abs(cor(x, y))
txt <- format(c(r, 0.123456789), digits=digits)[1]
txt <- paste(prefix, txt, sep="")
if(missing(cex.cor)) cex <- 0.6/strwidth(txt)
#text(0.5, 0.5, txt, cex = cex * r)
text(0.5, 0.5, txt, cex = cex)
}
pairs(RR, lower.panel=panel.smooth, upper.panel=panel.cor, diag.panel=panel.hist)
pairs(RR, lower.panel=panel.blank, upper.panel=panel.cor, diag.panel=panel.hist)