Cursera: Machine Learning Exercises 1 Accomplished.

machine_learning/mlclass-ex1-008/mlclass-ex1/computeCost.m

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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.
+
+%X = [ones(m,1) X];
+J = sum( (X*theta - y) .^ 2 ) / (2*m);
+
+
+% =========================================================================
+
+end