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

theme(axis.ticks.length)

http://docs.ggplot2.org/0.9.2.1/theme.html should be useful.

Edit Sorry, just read your question more carefully. Are the labeled ones the standard major.grid ticks? or labeled in some custom way?