ee 8

EENG 1910: Project I – Introduction to Electrical Engineering

Assignment-8

1. Create a MATLAB function that will take as inputs the radius (r) and height (h) of a cone and calculate its volume. The

formula to compute the volume of a cone is as follows.

𝑉 = 1

3 𝜋𝑟 2ℎ

Write a descriptive comment on the use of the function so that

the user by typing help nameofyourfunction has all the necessary

information to use your function.

In each of the following questions (2. & 3.), first, evaluate the

given MATLAB code for each of the test cases without using MATLAB.

Then, using MATLAB, check the answers you obtained first.

2. if n > 1 a. n = -25 m = ?

m = n+1 b. n = 2 m = ?

elseif n==0 c. n = 10 m = ?

m = n d. n = 0 m = ?

else

m = n-10

end

3. switch letter a. letter = ‘p’

case ‘x’ b. letter = ‘y’

disp(‘Hello’) c. letter = ‘q’

case{‘y’, ‘Y’} d. letter = ‘Q’

disp(‘Yes’) e. letter = ‘x’

case ‘Q’

disp(‘Quit’)

otherwise

disp(‘Error’)

end

Note: When you copy and paste codes into MATLAB, some characters

may not correctly translate. As a result, you may have to correct

them for the script to run properly.

4. A switch statement can often be used in place of a nested if- else or an if statement with many elseif clauses. Switch

statements are used when an expression is tested to see whether

it is equal to one of several possible values.

The script pickPizzaCase.m posted on Canvas is written using a

case statement. Analyze it and convert it to if-elseif-else

statement.

5. Write MATLAB script that will prompt the user for a temperature

in degrees Celsius, and then a letter ‘F’ for Fahrenheit or ‘K’

for Kelvin. The script should work weather a capital or small

case letter is entered. The script will then print the

corresponding temperature in the scale specified by the user.

For example, the outputs might look as follows.

>> conversioncode

Please enter a temperature value in Celsius: 45

Do you want K or F? k

The temperature in Kelvin is: 318.15.

Please enter a temperature value in Celsius: 29.3

Do you want K or F? f

The temperature in Fahrenheit is: 84.74.

>> conversioncode

Please enter a temperature value in Celsius: 78

Do you want K or F? K

The temperature in Kelvin is: 351.15.

>> conversioncode

Please enter a temperature value in Celsius: 74

Do you want K or F? P

Please enter F or K!

Note: Lesson-8 has a sample code that could simply be modified.

Also, conversioncode is simply the name that I have given to my

script. The conversions can be performed using the formulas below.

𝐾 = 𝐶 + 273.15

𝐹 = 9

5 𝐶 + 32

6. Use a for loop to sum the elements in the following vector: V=[10, 27, -66, 43, 72, 87, 56,98, 33, 23.5, 8.5, 77.7, 36,

24,11, 85, 55, 63, 4, 39, 100, -96, 4, 41, 189, -9,78.3, -83].

You will need to first determine the size (length) of the

vector. Check your answer using the MATLAB sum function.

7. Repeat the previous problem, this time using a while loop.

8. Create a function called “isInt” to check whether an input number is an integer. The function should display a sentence of

the form: “22.5 is not an integer!” or “99 is an integer!” if

the inputs were respectively 22.5 and 99.

9. In chemistry, the pH of an aqueous solution is a measure of its acidity. The pH scale ranges from 0 to 14, inclusive. A solution

with a pH of 7 is said to be neutral, a solution with a pH

greater than 7 is basic, and a solution with a pH less than 7

is acidic. Write a script that will prompt the user for the pH

of a solution, and will print whether it is neutral, basic, or

acidic. If the user enters an invalid pH, an error message

should be printed.