How to set x-axis labels under certain tick marks?

Is there a simple way to define tick mark labels? For example I have attached a plot which I would like to change. Instead of having the default tick labels, I would like to programmatically put tick labels under the positions of 20,60,100,and 120 (and get rid of the numerical tick labels). At this point those positions would be consistent but in the future they may change.

Answer 1

[Image Analyst]

Try this:

ax = gca; % Get handle
ax.XTicks = [20,60,100,120]
ax.XTickLabel = {'','','',''} % Labels are null.

[Kirby Fears]

http://www.mathworks.com/help/matlab/creating_plots/change-tick-marks-and-tick-labels-of-graph-1.html

[Tom Ruopp]

Thank you! The only issue is that

ax.Ticks

should be

ax.Tick

Without the 's'