I have a graph that plots velocity versus time and I have to indicate where/which data point on the plot accelerates, stays constant, and decelerates in MATLAB. This is what I have for graphing my plot:

>> t = [1.85 2.87 3.78 4.65 5.5 6.32 7.14 7.96 8.79 9.69]

>> d = [10 20 30 40 50 60 70 80 90 100]

>> v = diff(d)./diff(t)

>> plot(v)

>> title('Time versus Velocity for Usain Bolt')

>> xlabel('Time(s)')

>> ylabel('Velocity(m/s)')

>> figure(1)