ISSET Test If Variable Set

Section: Inspection Functions

Usage

Tests for the existence and non-emptiness of a variable. the general syntax for its use is 
   y = isset('name')

where name is the name of the variable to test. This is functionally equivalent to 

   y = exist('name','var') & ~isempty(name)

It returns a logical 1 if the variable is defined in the current workspace, and is not empty, and returns a 0 otherwise.

Example

Some simple examples of using isset 
--> who
  Variable Name       Type   Flags             Size
--> isset('a')

ans = 
 0 

--> a = [];
--> isset('a')

ans = 
 0 

--> a = 2;
--> isset('a')

ans = 
 1