?? modelerror.m
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function ASAE = modelerror(A, B) % evaluates the Average Sum of Absolute Error of the passed model
%
% Author: Wesam ELSHAMY
% wesamelshamy@ieee.org
% Electrical Engineering Dept., Cairo University, Egypt
global Na Nb Nk Y U
A = A(2 : end); % removing the leading 1
B = B(Nk + 1 : end); % removing the leading zeros
e = zeros(1, size(Y, 1));
a = zeros(1, size(A, 2));
b = zeros(1, size(B, 2));
for x = 1 : size(A, 2)
a(x) = A(size(A, 2) - x + 1);
end
for x = 1 : size(B, 2)
b(x) = B(size(B, 2) - x + 1);
end
for t = max(Na + 1, Nb + Nk) : size(Y, 1)
e(t) = Y(t) + a*Y(t - Na : t - 1) - b*U(t - Nk - Nb + 1 : t - Nk); % ARX model
end
ASAE = sum(abs(e))/size(e, 2); % and calculates the fitness
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