Question

Before reading this assignment, remember that the Guide to Mini Projects is ALWAYS part of the instructions for EVERY Mini Project Assignment. Please go back and read it before beginning.

Mini Project #2 – Bus Routes

Introduction

You are working for a city, and want to set up a system for better understanding the needs of the busses running on certain routes. Using demographic data and technical specifications of busses, the city has created data structures for each city bus with the following properties that do not change:

bus.mass – The mass of the buss

bus.passMass – The average mass of a passenger on a route

bus.engine – The amount of force the bus’s engine puts out per unit mass

In addition, you have added the following property to the structure for simulation purposes. This property

can change:

bus.numPass – The number of passengers on the bus.

Procedure

The city wants you to do some calculations on the amount of work buses have to do on bus routes, given the number of passengers entering and leaving busses. You will write a function called busSim that will take the following inputs:

bus – A structure with the format defined above. You can assume that it will start with a certain number of passengers on board.

passOn – An array that contains only integers. This is the number of passengers that get on at each stop.passOff – An array that contains only integers and is the same length as passOn. This is the number

of passengers that get off at each stop.

distance – An array that contains real numbers that is the same length as passOn containing the distance the bus has to travel after each bus stop to get to the next stop.

It should return the following ouputs:

bus – An updated version of the input structure with the final number of passengers.

passRecord – An array with the same length ad passOn with the number of passengers after each bus stop.

totalWork – A real number that is the total amount of work the bus’s engine has had to put out on the entire trip. You can assume that passengers will board and leave the bus at the first stop beforeyou have to make the first work calculation. You should therefore make as many work calculations as there are elements in each of the input arrays.

Additional Code – Data Entry Errors

Your function should work with any inputs that are of the correct input data types, even if they contain errors. You should handle those errors in the following ways:

• - If your input arrays are not all the same length you should only do calculations up to the index of the shortest array.

• - If the number of passengers would ever go below 0, it should instead be set to 0.

• - If the number of passengers would ever be a non-integer value, it should instead be rounded up

  to the nearest integer.

• - If a distance is listed as negative, treat it as positive

  You can assume the following and do not have to check for them:

• - Masses will always be positive

• - Engines will always put out positive force

• - The numbers in passOn or passOff will always be non-negative

Code for MatLab

Answer 1

function [bus,passRecord,totalWork] = busSim(bus,passOn,passOff,distance)

passOn = ceil(passOn);
passOff = ceil(passOff);
distance = abs(distance);

array_length = min(numel(passOn),numel(passOff));
passRecord = zeros(1,array_length);

aboard = bus.numpass+ passOn(1)-passOff(1);
passRecord(1) = aboard*(aboard>=0);

for i=2:array_length
aboard = passRecord(i-1) + passOn(i) - passOff(i);
passRecord(i) = aboard*(aboard>=0);
end

totalWork = sum(distance(1:array_length) .* bus.engine.*(bus.mass + bus.passMass.*passRecord)); % w = dxf
bus.numpass = passRecord(end);
end

-------------------------------------------------------------------

%command

clc
clear

%constants
bus.mass = 1000; %kg
bus.passMass = 50; %kg
bus.engine = 2; %N per unit mass

%some random variables
bus.numpass = randi(10);
passOn = randi(5,1,10);
passOff = randi(5,1,10);
distance = randi(30,1,10);

disp('INPUTS:')
disp('bus:');disp(bus)
disp('numpass:');disp(bus.numpass)
disp('passOn:');disp(passOn)
disp('passOff:');disp(passOff)

[bus,passRecord,totalWork] = busSim(bus,passOn,passOff,distance);

disp('OUTPUTS:')
disp('bus:');disp(bus)
disp('passRecord:');disp(passRecord)
disp('totalWork:');disp(totalWork)