increase main label plot size r code example

Example 1: how to change the font of the xlab in plot in r

plot(x,main="Title",xlab="xlabel",ylab="ylabel",sub="subtitle",
	 cex.lab=1.5, cex.axis=1.5, cex.main=1.5, cex.sub=1.5)

Example 2: text size in plots in r

text(x=10, y=10, 'text here', cex=2)
# the normal cex size is 1