FirstTime = Time(1) - 9/10 * mean(diff(Time));
NewTimes = linspace(FirstTime, Time(end), length(Data));
plot(NewTimes, Data);
The above code is for the case where the Time vector was first sampled at the 10th data point, and assumes that the time vectors were sampled at intervals that average out equally. The first line is to back-project to the starting time.
The code would be pretty similar in spirit if instead the first Time corresponds to the starting time, and it was the end time that was unknown.
