MATLAB Basic Introduction 3

Question 1

In MATLAB, what value does the built-in constant 'pi' represent?

Accepted Answer

3.14159265358979...

Answer

pi is a built-in MATLAB constant holding the double-precision value of π ≈ 3.14159265358979.

Question 2

Which command removes all variables from the MATLAB workspace?

Accepted Answer

clear all

Answer

clear all removes all variables and functions from the workspace memory.

Question 3

What is the output of size([1 2 3; 4 5 6]) in MATLAB?

Accepted Answer

[2 3]

Answer

size() returns a row vector [rows cols]; the 2×3 matrix yields [2 3].

Question 4

How do you concatenate two row vectors A = [1 2] and B = [3 4] horizontally in MATLAB?

Accepted Answer

[A, B]

Answer

Using a comma or space inside brackets [A, B] concatenates vectors horizontally to give [1 2 3 4].

Question 5

What does the 'end' keyword refer to when used as an index in MATLAB?

Accepted Answer

The last element of the array dimension

Answer

When used in indexing, end refers to the last index of the dimension being accessed.

MATLAB - MATLAB Technical Computing Practice Test