ISEMPTY Test For Variable Empty

Section: Inspection Functions

Usage

The isempty function returns a boolean that indicates if the argument variable is empty or not. The general syntax for its use is 
  y = isempty(x).

Examples

Here are some examples of the isempty function 
--> a = []

a = 
  []
--> isempty(a)

ans = 
 1 

--> b = 1:3

b = 
 1 2 3 

--> isempty(b)

ans = 
 0

Note that if the variable is not defined, isempty does not return true. 

--> clear x
--> isempty(x)
Error: Undefined function or variable x