MATLAB Data Types and Structures 4

Question 1

What does the `containers.Map` class provide in MATLAB?

Accepted Answer

A key-value data structure similar to a dictionary or hash map

Answer

`containers.Map` implements a hash map allowing lookup of values by arbitrary key types.

Question 2

How do you remove a field `z` from struct `s` in MATLAB?

Accepted Answer

rmfield(s, 'z')

Answer

`rmfield(s, 'z')` returns a new struct without the field `z`; it does not modify `s` in place.

Question 3

What is the output of `class(true)` in MATLAB?

Accepted Answer

'logical'

Answer

MATLAB's Boolean type is called `logical`, so `class(true)` returns `'logical'`.

Question 4

Which function checks if all elements in a logical array are true?

Accepted Answer

all()

Answer

`all()` returns true only if every element is nonzero/true, while `any()` returns true if at least one element is.

Question 5

What is the byte size of a `double` value in MATLAB?

Accepted Answer

8 bytes

Answer

`double` is a 64-bit (8-byte) floating-point type conforming to IEEE 754.

MATLAB - MATLAB Technical Computing Practice Test