ISSET  ISSET Test If Variable Set


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.
 