Free MATLAB MATLAB Environment and Syntax Questions and Answers

Question 1

Which of the following is an invalid variable name in MATLAB?

Accepted Answer

2start_variable

Answer

In MATLAB, a valid variable name must start with a letter, followed by any combination of letters, digits, or underscores. The name '2start_variable' is invalid because it begins with a digit.

Question 2

A user wants to remove all variables from the Workspace and clear the text from the Command Window. Which combination of commands achieves this?

Accepted Answer

clear; clc

Answer

The 'clear' command removes all variables from the current workspace. The 'clc' command clears all text from the Command Window, providing a 'clean screen'. The combination 'clear; clc' performs both of the desired actions.

Question 3

In the MATLAB Desktop Environment, which window is primarily used for writing, editing, and saving multi-line scripts and functions that can be executed as a whole?

Accepted Answer

Editor

Answer

The Editor is the component of the MATLAB environment designed for writing, editing, saving, and debugging scripts and function files (.m files). The Command Window is for executing single-line commands interactively.

Question 4

A user executes the following code in a new MATLAB session:

x = 1:5;
y = x(end) + x(1);

What is the value of 'y' in the Workspace?

Accepted Answer

6

Answer

The expression 'x = 1:5' creates a vector [1, 2, 3, 4, 5]. In MATLAB, array indexing starts at 1. The 'end' keyword, when used for indexing, refers to the last element of an array. Therefore, x(end) is 5 and x(1) is 1. The variable 'y' is assigned the sum of these two values, which is 5 + 1 = 6.

Question 5

How do you start a multi-line block comment in a MATLAB script?

Accepted Answer

%{

Answer

To create a block comment that spans multiple lines, you begin the block with '%{' and end it with '%}'. The '%%' syntax is used to create runnable code sections, and a single '%' comments out the rest of a single line.

MATLAB - MATLAB Technical Computing Practice Test

MATLAB - MATLAB Technical Computing Practice Test

Free MATLAB MATLAB Environment and Syntax Questions and Answers