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- 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.
- h_theta = X * theta;
- hy = h_theta - y;
- hysq = hy.^2;
- J = 1 / (2 * m) * sum(hysq);
- % =========================================================================
- end
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