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/exercises/mlclass-ex1/computeCost.m

http://github.com/jneira/machine-learning-course
Objective C | 19 lines | 14 code | 5 blank | 0 comment | 2 complexity | 135a6836d4d18ec9ffb286e5983162ee MD5 | raw file
 1function J = computeCost(X, y, theta)
 2%COMPUTECOST Compute cost for linear regression
 3%   J = COMPUTECOST(X, y, theta) computes the cost of using theta as the
 4%   parameter for linear regression to fit the data points in X and y
 5
 6% Initialize some useful values
 7m = length(y); % number of training examples
 8
 9% You need to return the following variables correctly 
10J = 0;
11
12% ====================== YOUR CODE HERE ======================
13% Instructions: Compute the cost of a particular choice of theta
14%               You should set J to the cost.
15
16J = sum(((X*theta)-y).^2)/(2*m);
17% =========================================================================
18
19end