The default size of axes labels created by using plot function does not seem to be large enough and also it does not look appealing. Therefore, we might want to change their size and color because the appearance of a plot matters a lot. This can be done by setting colors with col.lab and size with cex.lab.
> x<-rnorm(10) > y<-rnorm(10,0.5) > plot(x,y)
Changing the color of axes labels and the size of those axes labels −
> plot(x,y,col.lab="dark blue",cex.lab=3)