| FreeMat
    | 
Section: Inspection Functions
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. 
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