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 = 
  <double>  - size: [0 0]
  []
--> isempty(a)
ans = 
  <logical>  - size: [1 1]
 1  
--> b = 1:3
b = 
  <int32>  - size: [1 3]
 
Columns 1 to 3
 1  2  3  
--> isempty(b)
ans = 
  <logical>  - size: [1 1]
 0  

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

--> isempty(x)
ans = 
  <logical>  - size: [1 1]
 0