MATLAB Data Types and Structures 2

Question 1

What does the MATLAB function `iscell()` return when passed a cell array?

Accepted Answer

1

Answer

`iscell()` returns logical 1 (true) if the input is a cell array, and 0 otherwise.

Question 2

Which MATLAB syntax correctly accesses the second element of a cell array `C`?

Accepted Answer

C{2}

Answer

Curly braces `C{2}` extract the contents of a cell, while parentheses `C(2)` return a cell array subset.

Question 3

What is the default numeric data type for variables created by typing a number in MATLAB?

Accepted Answer

double

Answer

MATLAB defaults to `double` (64-bit floating point) for all numeric literals unless explicitly cast.

Question 4

How do you create a 1x3 struct array named `s` with field `name` in MATLAB?

Accepted Answer

s = struct('name', {'Alice','Bob','Carol'})

Answer

Passing a cell array of values to `struct()` automatically creates a struct array with one element per cell.

Question 5

What does `typecast(int32(1), 'uint32')` return in MATLAB?

Accepted Answer

The bit pattern of int32(1) reinterpreted as uint32

Answer

`typecast` reinterprets the underlying bit pattern without converting the value, so int32(1) becomes uint32(1) since the bits are identical.

MATLAB - MATLAB Technical Computing Practice Test