title: how to add xtick and xtick label in matlab without changing the rest of the automatic ticks and ticklabels
body: <p>I want to mark some special point on the x-axis of a matlab plot, and I'm satisfied with the rest automatic x-ticks that matlab produce. Therefore I do not want to change them, only to add this special xtick and xticklabel in the midst of them. What is the easiest way to do it in a matlab m-function? </p>