MATLAB General MCQ 3 — Questions and Answers
Question 1: In MATLAB, what does the function strcmp(s1, s2) return?
- The difference between two strings
- 1 if strings are equal, 0 otherwise (Correct answer)
- A sorted combination of both strings
- The index of the first differing character
Correct answer: 1 if strings are equal, 0 otherwise
strcmp returns logical 1 (true) if s1 and s2 are identical, and logical 0 (false) otherwise.
Question 2: Which MATLAB function converts a numeric value to a string?
- str2num
- char
- num2str (Correct answer)
- int2str
Correct answer: num2str
num2str converts a numeric array to a character array (string), with optional format control.
Question 3: What does the MATLAB function isempty(A) return when A = []?
- 0
- NaN
- 1 (Correct answer)
- Inf
Correct answer: 1
isempty returns 1 (true) when the array has any dimension of size zero, such as an empty matrix [].
Question 4: Which statement correctly defines an anonymous function for f(x) = x^2 + 1 in MATLAB?
- f = function(x) x^2 + 1
- f = @(x) x^2 + 1 (Correct answer)
- f(x) = x^2 + 1
- def f(x): x**2 + 1
Correct answer: f = @(x) x^2 + 1
Anonymous functions in MATLAB are created with the @ operator followed by the argument list and expression.
Question 5: What is the result of logical expression (3 > 2) & (5 < 4) in MATLAB?
- 1
- 0 (Correct answer)
- true
- Error
Correct answer: 0
The & operator is element-wise AND; (3>2) is true and (5<4) is false, so true & false = 0.
Question 6: Which MATLAB function computes the eigenvalues and eigenvectors of a square matrix?
- svd(A)
- eig(A) (Correct answer)
- det(A)
- inv(A)
Correct answer: eig(A)
eig(A) returns the eigenvalues of A, and [V,D] = eig(A) returns eigenvectors V and diagonal eigenvalue matrix D.
Question 7: What does the MATLAB command 'whos' display?
- The current working directory
- A list of current workspace variables with size, bytes, and class (Correct answer)
- All installed toolboxes
- The command history
Correct answer: A list of current workspace variables with size, bytes, and class
whos lists all variables in the current workspace along with their size, bytes, and data class.
MATLAB General MCQ 3
In MATLAB, what does the function strcmp(s1, s2) return?