MATLAB Programming and Scripting 4

Question 1

How do you preallocate a 100x100 matrix of zeros in MATLAB?

Accepted Answer

M = zeros(100,100)

Answer

zeros(m,n) creates an m-by-n matrix of double-precision zeros, which is the standard preallocating technique.

Question 2

In MATLAB, what does the colon operator 1:2:10 generate?

Accepted Answer

[1 3 5 7 9]

Answer

The syntax start:step:end generates [1 3 5 7 9] — values from 1 to 10 with step 2.

Question 3

Which statement correctly defines a function handle in MATLAB?

Accepted Answer

f = @(x) x^2

Answer

The '@(x) x^2' syntax creates an anonymous function handle in MATLAB.

Question 4

What does 'fieldnames(S)' return when S is a MATLAB structure?

Accepted Answer

A cell array of field name strings

Answer

fieldnames() returns a cell array of character vectors, each containing one field name of the struct.

Question 5

Which MATLAB function evaluates a string as a MATLAB expression?

Accepted Answer

eval()

Answer

eval() executes the MATLAB code contained in a character vector or string.

MATLAB - MATLAB Technical Computing Practice Test