octave - 每次我尝试运行此代码并且我不知道该怎么办时，都会出现一条错误消息，例如“错误：在行附近解析错误”？

Question

function [theta, J_history] = gradientDescent(X, y, theta, alpha, num_iters)
%GRADIENTDESCENT Performs gradient descent to learn theta
%   theta = GRADIENTDESCENT(X, y, theta, alpha, num_iters) updates theta by 
%   taking num_iters gradient steps with learning rate alpha

% Initialize some useful values
m = length(y); % number of training examples
J_history = zeros(num_iters, 1);

for iter = 1:num_iters

    % ====================== YOUR CODE HERE ======================
    % Instructions: Perform a single gradient step on the parameter vector
    %               theta. 
    %
    % Hint: While debugging, it can be useful to print out the values
    %       of the cost function (computeCost) and gradient here.
    %
    %theta(iter)=theta(iter)-0.01*(1/m)*(((theta(1)+theta(2))*X-y)*X(iter,2))
    theta=theta-(alpha*(1/m)*(X*theta-y)*X(iter,2);
         % ============================================================
    % Save the cost J in every iteration    
    J_history(iter) = computeCost(X, y, theta);

end

end

Answer 1

theta=theta-(alpha*(1/m)*(X*theta-y)*X(iter,2);

据我所知，括号不平衡？

你错过了一个右括号)，不是吗？