How do you remove x-axis tick marks and keep the numbers?

If I want to delete the tick marks on an x-axis only meanwhile keep the digits, what can I use? I tried set(gca,'TickLength'.[0 0.1]) but that removed the tickmarks for both the y and x-axis. I also tried set(gca,'XTick', []) but that removed the x-axis and all the digits.

Answer 1

[Walter Roberson]

plot(rand(1,20))
ax = gca;
ax.XAxis.TickLength = [0 0.1];