how does global function work in this code?

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Fred
Fred 2013-4-5
Hi, I am kind of beginner in MATLAB and I try to use the following code. It seems I should define p and q but I can not figure out how should I enter p and q to the code
function [CL,e,psi,r] = ARMA_FULL(theta0, data)
%function CL=ARMA_FULL(theta0,data)
% define the global vector
global p q;
x=data;
% initial parameter set theta0 is a column vector;
% c is the constant of the general ARMA model;
% ar is the (1*p) vector;
% ma is the (1*q) vector;
if p==0;
% initial parameters for pure moving average model
y=x-mean(x);
ma=theta0(2:end-1);
s=theta0(end);
.
.
.

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per isakson
per isakson 2013-4-5
编辑：per isakson 2013-4-5
Try
>> global my_global
>> my_global= 17
my_global =
17
>> global_demo
17
>>
where
function global_demo()
global my_global
disp( my_global )
end
Matt Fig says: Globals not good.
Search for "globals evil"! You'll find: Global Variables Are Bad and more

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