As part of your solution you should define a function m-file that takes an array of heart rate values as its only input argument and returns as its output an array of the indices of all sudden changes...

As part of your solution you should define a function m-file that takes an array of heart rate values as its only input argument and returns as its output an array of the indices of all sudden changes and also values indicating whether each change was an increase or decrease. If the function is provided with an empty array it should exit with an appropriate error message. A separate script should call your function and should also take responsibility for reading the data (see Section 1.6) and printing the output message(s).