MATLAB Programming and Scripting 5

Question 1

Which MATLAB function returns the size of an array along a specific dimension?

Accepted Answer

size(A, dim)

Answer

size(A, dim) returns the length of array A along the specified dimension.

Question 2

What does the tilde '~' symbol mean when used as a function output argument in MATLAB?

Accepted Answer

The output is ignored/discarded

Answer

Using '~' as a placeholder output argument tells MATLAB to discard that output without storing it.

Question 3

In MATLAB, which type of file has the '.m' extension and contains only commands (no function definition)?

Accepted Answer

Script file

Answer

A script file (.m) contains a sequence of MATLAB commands that execute in the calling workspace, unlike function files which define functions.

Question 4

What does 'cellfun(@numel, C)' return for a cell array C?

Accepted Answer

A numeric array where each element is the number of elements in the corresponding cell

Answer

cellfun applies a function to each cell and by default returns a numeric array of the scalar results.

Question 5

How do you add a new field 'age' with value 30 to an existing structure variable 'person'?

Accepted Answer

person.age = 30

Answer

MATLAB adds a new field to a struct using dot notation assignment: person.age = 30.

MATLAB - MATLAB Technical Computing Practice Test