机器学习作业之 Linear Regression with Multiple Variables (Week 2)

function J = computeCost(X, y, theta)
%COMPUTECOST Compute cost for linear regression
%   J = COMPUTECOST(X, y, theta) computes the cost of using theta as the
%   parameter for linear regression to fit the data points in X and y

% Initialize some useful values
m = length(y); % number of training examples

% You need to return the following variables correctly 
J = 0;

% ====================== YOUR CODE HERE ======================
% Instructions: Compute the cost of a particular choice of theta
%               You should set J to the cost.

 for i=1:m
 J = J+(X(i,:)*theta - y(i,:))^2;
 end
 J = J/(2*m);
 
% =========================================================================

endfunction J = computeCost(X, y,