Section: Variables and Arrays
global statement
is
global variable_1 variable_2 ...
The global statement must occur before the variables
appear.
     set_global.m
function set_global(x)
  global common_array
  common_array = x;
The second function retrieves the value from the global variable
     get_global.m
function x = get_global
  global common_array
  x = common_array;
Here we exercise the two functions
--> set_global('Hello')
--> get_global
ans = 
Hello