Assuming you already know what the bubble sort algorithm is and have programmed it, and can use the MATLAB sort function, all you need then are the tic and toc functions (the timeit function is also a possibility) to do the timing.
For the vectors, use any of the random number functions: rand, randi, randn, or any of the others for your vector of numbers to be sorted. Obviously, use the same random number vector for both algorithms to do the comparison. I would use a loop to generate a new random number vector each time, do the timing of the two algorithms, and store the results, but there may be other methods.
