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EENG 1910: Project I – Learning to Learn

Assignment-7

1. What is MATLAB and what is it used for?

2. Research and provide an example of real-world applications that

MATLAB was used to implement.

Test your understanding of MATLAB with these short questions. Each

question should not require more than couple lines of commands or

explanation.

3. Given the matrix A = [3 8 4 5; 0 -1 -2 4; 3 8 4 75] run each of

the commands below and explain the observed result.

a. A’ b. A(10) c. A(3,1) d. A(3,:) e. A(:,2) f. A(:,[1:3]) g. A([1 3],[3 2]) h. [A;A(end-1,:)] i. A(:,[2 4 1 3]) j. A(1:2,:) = [] k. A(3:4,:) = [2:3:11;5:8] l. A(5,:) = zeros(1,4) m. sum(A) n. sum(A,2) o. [A;sum(A)] p. numel(A) q. B = reshape(A,1,numel(A)) r. [r,c] = size(A) s. length(A) t. [x,y] = size(B) u. length(B) v. help elfun

4. The colon (:) operator and linspace function are used in MATLAB

to create linearly spaced vectors. Observe the results of the

example provided using these two methods. Then, generate the

vectors below (a. b. c. and d.) using the colon operator and the

linspace function.

>> ls = linspace(3,15,5)

ls =

3 6 9 12 15

>> ls = 3:3:15

ls =

3 6 9 12 15

a. [1 2 3 4 5 6 7 8 9 10]

b. [9 7 5]

c. [-3 -6 -9 -12 -15 -18]

d. [1 3 5 7 9 3 6 9 12 15]

5. If a variable has the dimensions 5 x 1, could it be considered

to be (select all that apply):

a. a matrix?

b. a row vector?

c. a column vector?

d. a scalar?

6. If a variable has the dimensions 1 x 1, could it be considered

to be (select all that apply):

a. a matrix?

b. a row vector?

c. a column vector?

d. a scalar?

7. Create the two (2x2) matrices A and B define as follows:

A = [ 9 5 3 7

], B = [ 4 12 −8 1

]

a. Compute C1 = A + B and C2 = A – B and analyze how the operations are performed.

b. Compute the matrix products D1 = A*B and D2 = B*A. Are D1 and D2 the same? If not why?

c. Now, using element-wise multiplication (.*) compute D3 = A.*B and D4 = B.*A. Are D3 and D4 the same? If so why?

d. Is D1 = D3 and is D2 = D4? Why?

Type help input, help disp, help fprintf to learn more about the

MATLAB functions that are required to answer questions 8 and 9.

8. Create a MATLAB program that will ask (input) the user his/her

weight in pounds and convert the given value to kilograms. The

program should display (disp or fprintf) a statement in the

following form: ‘Your weight in kilograms is 100.’

Note that 1kilogram = 2.2pounds.

9. Create a MATLAB program that will ask a user for his/her first

name, his/her last name, and display the sentence: Your full name

is First Name Last Name. See the example below.

Enter your first name: Dak

Enter your last name: Prescott

Your full name is: Dak Prescott

Note: The input function works differently when asking the user

for a numerical value and when asking the user for a character or

string value.

10. What are the different types of design projects and what are

the characteristics of each one?

11. What are the questions that should be answered when

selecting a project?