Problem with Gradient descent

Hello,

I am currently following the programm of Machine Learning and I have a problem with the first assignment since 2 months.

When I try to plot the gradient descent: Matlab send me this error:

gradientDescent
Not enough input arguments.

Error in gradientDescent (line 7)
m = length(y); % number of training examples

This is my code :

function [theta, J_history,theta_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.
    %
    
    error=(X.*theta-y)
    temp0=theta(1)+(alpha/m)*sum(error.*X(:,1));
    temp1=theta(2)+(alpha/m)*sum(error.*X(:,2));
    theta=[temp0,temp1]





    % ============================================================

    % Save the cost J in every iteration    
    J_history(iter) = computeCost(X, y, theta);

end

end

Thanks in advance for your help

[Adam Danz]

What isn't clear about,

gradientDescent
Not enough input arguments.  % <----------

?

Are you providing all 5 inputs to your function?

Do you have more than 1 function named gradientDescent? (check using "which gradientDescent -all)

[Faizan Hussain]

Hello Adam, I'm facing the same problem. I have only one function called gradientDescent. The problem still persists. I'm using the same code script above. It can only run if the matlab recognizes the variable m.

[Adam Danz]

Could you provide a minimal working example that reproduces the problem?

[ANOOP ANOOP SINGH]

same problem Error in gradientDescent (line 7)

m = length(y); % number of training examples

[Adam Danz]

First person to provide a minimal working example that reproduces the problem gets help.

[Raha Pedram]

Unfortunately, I have the same problem. I don not know how to fix this issue.

[Kevin Chan]

X,y, etc variables have not been defined.

[Walter Roberson]

X, y are supposed to be passed into the function.

We have no information as to how m is defined.