View the x-axis limits. Since the duration tick labels are in terms of a single unit (minutes), the limits
are stored in terms of that unit.
xl = xlim
xl = 1x2 duration
-4.5 sec
184.5 sec
Change the format for the duration tick labels to display in the form of a digital timer that includes
more than one unit. For a list of formatting options, see the xtickformat function.
xtickformat('mm:ss')
7 Dates and Time
7-38