Why do i recieve this error?

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.

[Hp2609]

w_opt is (11,1) vector, X_train is (333,11) matrix and y_train is (333,1) vector

Answer 1

[Jan]

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);

[Hp2609]

got it thanks