ggplot2: Have shorter tick marks for tick marks without labels

Question

I have a plot using ggplot2 in which I\'d like many ticks along the x-axis, yet only some of the ticks will have tick labels associated with them. However, I\'d like the tic

Answer 1

In base R, you can suppress the x-axis with the initial plot call (with xaxt='n'), and then use tcl to control tick length (see ?par) with two axis(1, ...) calls.

plot(1:10, xaxt='n', ylab='', las=1)
axis(1, at=1:10, tcl=-0.8)
axis(1, at=seq(0, 11, 0.2), labels=NA)