Why do i recieve this error?

2021 3 9
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更新时间：2021 3 9
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for i=1:m
for j=2:11
mse=1/m(sum(w_opt(1)+w_opt(j)*X_train(i,j)-y_train(i))^2);
end
end
Array indices must be positive integers or logical values.

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Hp2609
Hp2609 2021-3-9
w_opt is (11,1) vector, X_train is (333,11) matrix and y_train is (333,1) vector

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Jan
Jan 2021-3-9
编辑：Jan 2021-3-9

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This appears in your code:
mse=1/m(sum(w_opt(1)+w_opt(j)*X_train(i,j)-y_train(i))^2);
% ^^^^^
This treats m as a variable and sum(w_opt(1)+w_opt(j)*X_train(i,j)-y_train(i))^2 as index.
Maybe you mean:
mse = 1 / m * (sum(w_opt(1) + w_opt(j) * X_train(i,j) - y_train(i))^2);

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