On 24.11.2011 15:59, Johannes Radinger wrote:
Hello,
I'd like to add custom labels to my pair() plot. These
labels include math expression but they aren't correctly
displayed...
Looks fine for me in R-2.14.0 on the windows() device (alpha, text,
beta). (Both version and device you used are unspecified)
Further, I want that the boxes for the text.panel (diagonal)
have an other background color (grey80). Is that generally
possible? If yes how do I have to set it?
What I've so far is:
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<- 0.5/strwidth(txt)
test<- cor.test(x,y)
# borrowed from printCoefmat
Signif<- symnum(test$p.value, corr = FALSE, na = FALSE,
cutpoints = c(0, 0.001, 0.01, 0.05, 0.1, 1),
symbols = c("***", "**", "*", ".", " "))
text(0.5, 0.5, paste(txt,Signif), cex = 2)
}
#correlation pair plot
pairs(df, labels=c(expression(alpha),"text",expression(beta)),
lower.panel=panel.smooth, upper.panel=panel.cor)
Not easily without changing the original code, I think, but you can cheat:
pairs(iris, labels = expression(alpha, "text", beta),
lower.panel=panel.smooth, upper.panel=panel.cor,
diag.panel = function(...)
rect(par("usr")[1], par("usr")[3],
par("usr")[2], par("usr")[4], col="grey80")
)
Best,
Uwe Ligges
Maybe someone knows how to do that and can give some hints...
/Johannes
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