how to disable the picture

Hi, every time I run the following code, a figure is generated. How can I disable it?

Thanks.

a0 = 0.05; a1 = 0.1; b1 = 0.85;
nu = randn(2300,1);
epsi = zeros(2300,1);
h = zeros(2300,1);

for i=2: 2300 
  h(i) = a0 + a1 * epsi(i-1)^2 + b1 * h(i-1)  ; 
  epsi(i) = nu(i) * sqrt(h(i));
end

yt = zeros(2300,1);

for i=1: 2300 
  yt(i) = epsi(i)*epsi(i);
end

order = 15;
m = arx(yt, order);

[Image Analyst]

I ran it up through the arx() function and it produced no figure. It must get produced in arx(). What is that function? Is it in some toolbox that you forgot to list in the Products below, like the MATLAB coder which you listed in the Tags?

[dav]

Sorry a part of the code was missing in my first question

here's the code again.. It is the corr function of the residuals

a0 = 0.05;
a1 = 0.1;
b1 = 0.85;
nu = randn(2300,1);
epsi = zeros(2300,1);
h = zeros(2300,1);

for i=2: 2300
  h(i) = a0 + a1 * epsi(i-1)^2 + b1 * h(i-1) ;
  epsi(i) = nu(i) * sqrt(h(i));
end
yt1 = zeros(2300,1);
for i = 1 : 2300
  yt1(i) = epsi(i)*epsi(i);
end
yt=yt1(1301:2300);
order = 15;
m = arx(yt1, order);
r = resid([yt1(1:order);yt1], m);
r = r(order+1:end);

[Walter Roberson]

I do not understand what this question has to do with the Mathworks product that converts MATLAB code to C or C++ code? You tagged this with "MATLAB Coder" ?

[Image Analyst]

And I still don't get a spurious figure, or any figure at all. It runs up until the call to arx() and then bombs. Again, what toolbox is arx() in? I guess it doesn't matter though since whatever toolbox it's in, I don't have it, but others who might want to help you might want to know this so they don't waste their time too. Or is arx() some custom m-file you wrote?

[Walter Roberson]

arx() appears to be in Systems Identification but that does not appear to me to plot anything.

[dav]

I am sorry its in the system identification tool box

[Walter Roberson]

Have you tried using the debugger and stepping through the code to find out which command is generating the plot ?

Answer 1

[Youssef Khmou]

hi,

your code does not produce any figure,

but if you want, you can add the following at the end of your code :

 close;

Answer 2

[Rajiv Singh]

It is the RESID command that is bringing up the plot. It belongs to System Identification Toolbox. To make it work as documented (no figures when called with output arguments), use an IDDATA object to represent the data, as in:

 r = resid(iddata([yt1(1:order);yt1]), m);

Calling RESID with double vector representing data is supported for backward compatibility. However, in this mode, the plot also gets shown since this was the behavior in the past before IDDATA object was introduced (I believe in ver 5).

[dav]

thnks. but the problem is that now I dont get the residuals either... can u fix that please?

I need to get the residuals in to a vector (r). But when i type r at the command prompt I dont see the residuals.

thanks