Logical values in MATLAB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are logical values in MATLAB?

Logical values in MATLAB represent true or false states, stored as 1 (true) or 0 (false). They are used for decision making and conditions.

beginner

How do you create a logical true and false in MATLAB?

You can create logical true with true or 1, and logical false with false or 0. For example, a = true; and b = false;.

intermediate

What is the output of logical(5) in MATLAB?

The output is 1 (true) because any nonzero number converts to logical true.

intermediate

How can logical values be used in MATLAB indexing?

Logical values can index arrays by selecting elements where the logical array is true. For example, A([true false true]) returns the 1st and 3rd elements of A.

beginner

What is the difference between == and = in MATLAB?

= is used to assign values to variables, while == tests equality and returns logical true or false.

What does the expression logical(0) return in MATLAB?

A 0 (false)

B 1 (true)

C Error

D NaN

logical(0) returns 0, which means false.

Which of these is a logical true value in MATLAB?

A false

B 1

C 0

D -1

In MATLAB, 1 represents logical true.

What will A([true false true]) do if A = [10 20 30]?

A [10 30]

B [10 20 30]

C [20]

D Error

The logical index selects the 1st and 3rd elements, so output is [10 30].

What is the result of 5 == 5 in MATLAB?

A 5

B false

C Error

D true

5 == 5 tests equality and returns logical true.

Which operator assigns a value to a variable in MATLAB?

A ==

B &&

C =

D ~=

= is the assignment operator.

Explain what logical values are in MATLAB and how they are used.

Think about how computers decide yes/no or on/off.

Describe how logical indexing works with an example in MATLAB.

Imagine using a filter to pick certain items.