plot - corrplot parameters in R

Question

I have used the corrplot as below, but as you can see I need to enlarge the font size of numbers inside the circles and then the plot title is not in a correct position and font size(not visible completely) but I can not find the parameters for them. I will be grateful if you could help.

library(corrplot)

png(height=1200, width=1200, file="overlap.png")

col1 <-rainbow(100, s = 1, v = 1, start = 0, end = 0.9, alpha = 1)
test <- matrix(data=c(20:60),nrow=7,ncol=7)

corrplot(test,tl.cex=3,title="Overlaps Between methods",
  method="circle",is.corr=FALSE,type="full",
  cl.lim=c(10,100),cl.cex=2,addgrid.col="red",
  addshade="positive",col=col1, diag=FALSE,
  addCoef.col = rgb(0,0,0, alpha = 0.6)
)

dev.off()

Answer 1

The problem seems to be with the png() with the height=1200 and width=1200 options you provide. Try changing that line to:

png(height=1200, width=1200, pointsize=25, file="overlap.png")

The default pointsize = 12 somehow reduces the fonts of the labels and title, for some reason.

Edit: To see the title properly add this parameter to your corrplot:

mar=c(0,0,1,0)

So the entire command set is:

library(corrplot)
png(height=1200, width=1200, pointsize=25, file="overlap.png")
col1 <-rainbow(100, s = 1, v = 1, start = 0, end = 0.9, alpha = 1)
test <- matrix(data=c(20:60),nrow=7,ncol=7)
corrplot(test,tl.cex=3,title="Overlaps Between methods",
method="circle",is.corr=FALSE,type="full",
cl.lim=c(10,100),cl.cex=2,addgrid.col=
"red",addshade="positive",col=col1, addCoef.col = rgb(0,0,0, alpha =
0.6), mar=c(0,0,1,0), diag= FALSE) 
dev.off()