how to disable the picture

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dav 2013-2-18

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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);

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dav 2013-2-19

I am sorry its in the system identification tool box

Walter Roberson 2013-2-19

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

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回答（2 个）

Youssef Khmou 2013-2-19

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hi,

your code does not produce any figure,

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

close;

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Rajiv Singh 2013-2-19

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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).