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Unrecognized function or variable 'arma'

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A code snippet:
% Input data
X = dY;
% BIC cost for different combinations of p and q
bic = zeros(2,2);
for p = 1:2
for q = 1:2
[theta,~,logl,~] = arma(X,p,q,0);
k = (p+q+1)*numel(X);
bic(p,q) = -2*logl + k*log(numel(X));
end
end
After running the program, it shows the message:
"Unrecognized function or variable 'arma'."
What could be the cause of this problem?

Accepted Answer

Dyuman Joshi
Dyuman Joshi on 26 Apr 2023
Moved: Image Analyst on 26 Apr 2023
Given the syntax used, arma is a function, but it is not an inbuilt function.
Do you have a function defined as arma? If yes, is it in the current directory? If no, well, then you need to define arma(), before using it.
  4 Comments
Dyuman Joshi
Dyuman Joshi on 26 Apr 2023
Which arima? There are 2 such functions arima and arima. Which one did you use? None of the these functions provide 4 outputs as used in the above code (and thus the error).
It seems that you have copied this code from somewhere, which used a user-defined function called arma, which was not provided with the code.

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