Categories: Arrays, Matrices, Plotting, Logic, Functions
Matrices
Plotting
Logic
Functions
100
How do you create an array of 10 evenly spaced numbers between 0 and 5?
linspace(0, 5, 10)
100
What function creates a 4x4 identity matrix?
eye(4)
100
Which function adds a title to a MATLAB plot?
title
100
What does num > 10 return if num = 15?
true
100
What keyword is used to define a function in MATLAB?
function
200
What is the output of this code: x = 1:2:9; disp(x);?
[1, 3, 5, 7, 9]
200
How do you access the element in the 2nd row, 3rd column of matrix A?
A(2, 3)
200
What MATLAB command overlays multiple plots on the same figure?
hold on
200
Write a simple if statement that displays "Yes" if x > 5.
200
How do you specify multiple outputs in a MATLAB function?
Use square brackets: [out1, out2] = myFunction(inputs)
300
Which MATLAB function returns the indices of non-zero elements in an array?
find
300
If A = [1, 2; 3, 4] and B = [5, 6; 7, 8], what is A .* B?
[5, 12; 21, 32]
300
How do you label the y-axis of a plot with the text "Amplitude"?
ylabel('Amplitude')
300
What is the difference between && and & in MATLAB?
&& is used for short-circuit logical operations; & is for element-wise logical operations.
300
What does this function return for x = 2? 
16
400
If A = [1, 2, 3]; B = [4, 5, 6];, what does C = [A; B]; create?
A 2x3 matrix
[1, 2, 3;
4, 5, 6]
400
What is the determinant of the matrix A = [1, 2; 3, 4]?
det(A) = -2
400
What command would you use to create a subplot with 2 rows and 3 columns in the first position?
subplot(2, 3, 1)
400
If x = 0, what does this code display?
Zero
400
Write a function that computes the area of a circle given the radius.
500
Write a command to extract every 3rd element from an array x.
x(1:3:end)
500
What does rank([1, 2; 2, 4]) return, and why?
1 because the rows are linearly dependent.
500
Write the command to plot y=x2y = x^2y=x2 for x=−5x = -5x=−5 to x=5x = 5x=5.
x = -5:0.1:5; y = x.^2; plot(x, y);
500
What will this code output? 
Empty array
500
What does nargin do inside a MATLAB function?
Returns the number of input arguments passed to the function.