Relational expressions in MATLAB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a relational expression in MATLAB?

A relational expression compares two values or arrays and returns a logical array of true (1) or false (0) depending on the comparison.

beginner

Which symbol is used for 'greater than or equal to' in MATLAB?

The symbol '>=' is used for 'greater than or equal to' in MATLAB.

beginner

What is the result of the expression: 5 < 3 in MATLAB?

The result is logical 0 (false) because 5 is not less than 3.

intermediate

How does MATLAB handle relational expressions with arrays?

MATLAB compares each element of the arrays element-wise and returns a logical array of the same size with true or false values.

beginner

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

'==' is a relational operator used to test equality, returning true or false. '=' is an assignment operator used to assign values to variables.

What does the relational operator '<=' mean in MATLAB?

A Less than or equal to

B Greater than or equal to

C Equal to

D Not equal to

The operator '<=' means 'less than or equal to' in MATLAB.

What is the output of the expression: [1 3 5] > 3 in MATLAB?

A [0 1 1]

B [1 1 1]

C [0 0 1]

D [1 0 0]

Each element is compared to 3: 1>3 is false (0), 3>3 is false (0), 5>3 is true (1).

Which relational operator checks if two values are not equal in MATLAB?

A ~=

B ==

C !=

D =

The operator '~=' means 'not equal to' in MATLAB.

What type of value does a relational expression return in MATLAB?

A String value

B Logical value (true or false)

C Numeric value

D Character array

Relational expressions return logical values: true (1) or false (0).

What happens if you compare two arrays of different sizes using relational operators in MATLAB?

A MATLAB compares element-wise ignoring extra elements

B MATLAB automatically resizes arrays

C MATLAB returns a scalar logical value

D MATLAB returns an error

MATLAB requires arrays to be the same size or compatible for element-wise comparison; otherwise, it returns an error.

Explain what relational expressions are in MATLAB and how they are used with arrays.

Think about how MATLAB compares numbers or arrays and what kind of result it gives.

List the common relational operators in MATLAB and describe what each one does.

Focus on the symbols and their meanings for comparing values.