Variable creation and assignment in MATLAB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a variable in MATLAB?

A variable in MATLAB is a name that stores data or values which can be used and changed during the program.

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How do you create and assign a value to a variable in MATLAB?

You create a variable by writing its name, then an equal sign (=), and then the value you want to store. For example: x = 5;

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What happens if you assign a new value to an existing variable in MATLAB?

The old value is replaced by the new value. MATLAB updates the variable to hold the new data.

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Can variable names in MATLAB contain spaces or start with a number?

No, variable names cannot contain spaces and cannot start with a number. They must start with a letter and can include letters, numbers, and underscores.

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What is the difference between x = 5 and x = '5' in MATLAB?

x = 5 assigns the number 5 to x, while x = '5' assigns the character '5' (a text) to x.

Which of the following is a valid variable name in MATLAB?

A var-1

B 1stVar

C my var

D my_var1

Variable names must start with a letter and cannot contain spaces or special characters like '-'.

What does the statement a = 10; do in MATLAB?

A Creates a variable 'a' and assigns it the value 10

B Deletes the variable 'a'

C Prints the value 10

D Creates a function named 'a'

The statement assigns the value 10 to the variable named 'a'.

If you write x = 5; then x = 7;, what is the value of x?

A 7

B 5

C 12

D Error

The second assignment replaces the first, so x holds the value 7.

Which symbol is used to assign a value to a variable in MATLAB?

A :=

B ==

C =

D ->

The equal sign '=' is used for assignment in MATLAB.

What type of data does name = 'John'; store in the variable 'name'?

A Number

B Character array (text)

C Boolean

D Function

Text in single quotes is stored as a character array in MATLAB.

Explain how to create a variable and assign a value to it in MATLAB.

Think about the simple statement where you name something and give it a value.

What are the rules for naming variables in MATLAB?

Consider what characters are allowed and where the name can start.