Modify axis size when using gap.plot

Question

I am creating a plot with axes breaks using the package plotrix, but the standard cex.axis does not seem to work when I build a gap.plot.

Do you know how to proceed to modify the size of the axis?

Answer 1

If you set cex.axis using the par command, you can modify the size of the magnification for axis annotation:

library(plotrix)

twogrp <- c(rnorm(5)+4,rnorm(5)+20,rnorm(5)+5,rnorm(5)+22)
gpcol <- c(2,2,2,2,2,3,3,3,3,3,4,4,4,4,4,5,5,5,5,5)

par(cex.axis=2, cex.lab=1.5)
gap.plot(twogrp, gap=c(8,16), xlab="Index", ylab="Group values",
  main="Gap on Y axis", col=gpcol)