hey ,i am using this function to implement gradient descent but it returns only the theta value not the J_history value,Please help me in this situtation

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Ashok Saini
Ashok Saini 2022-7-1
编辑： Rohit Kulkarni 2022-7-2
function [theta,J_history] = gradientDescent(X, y, theta, alpha, num_iters)
% Initialize some useful values
m = length(y); % number of training examples
J_history = zeros(num_iters, 1);
for iter = 1:num_iters
a1=(X*theta-y);
a2=(X*theta-y).*X;
theta(1)=theta(1)-alpha*sum(sum(a1))*(1/m);
theta(2)=theta(2)-alpha*sum(sum(a2))*(1/m);
% Save the cost J in every iteration
J_history(iter) = computeCost(X, y, theta);
end
end

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回答（1 个）

Rohit Kulkarni
Rohit Kulkarni 2022-7-2
编辑：Rohit Kulkarni 2022-7-2
Hi Ashok,
Are you facing this same issue :
https://in.mathworks.com/matlabcentral/answers/787299-gradient-descent-fix
The answer to this may solve your problem.

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