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Subsections

ISEMPTY Test For Variable Empty

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: []
  []
--> 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)
Error: Undefined function or variable x



Samit K. Basu 2005-03-16