Nothing
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.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, use = "complete.obs"))
txt <- format(c(r, 0.123456789), digits = digits)[1]
txt <- paste(prefix, txt, sep = "")
if (missing(cex.cor)) cex <- 0.8 / strwidth(txt)
text(0.5, 0.5, txt, cex = cex * r)
}
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