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Asked by Fred
on 5 Apr 2013

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); . . .

Answer by per isakson
on 5 Apr 2013

Edited by per isakson
on 5 Apr 2013

Accepted answer

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

## 1 Comment

## per isakson

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/70024#comment_141462

Try to avoid globals. Don't make it a habit to use them.