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Compute Cost (for one variable)

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neingeist 2014-10-01 22:05:13 +02:00
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ex1/computeCost.m
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@ -6,16 +6,18 @@ function J = computeCost(X, y, theta)
% Initialize some useful values
m = length(y); % number of training examples
% You need to return the following variables correctly
% 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.
predictions = X * theta;
errors = predictions - y;
squared_errors = errors .^ 2;
J = 1/(2*m) * sum(squared_errors);
% =========================================================================