/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

  1. function 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. % Initialize some useful values
  6. m = length(y); % number of training examples
  7. % You need to return the following variables correctly
  8. J = 0;
  9. % ====================== YOUR CODE HERE ======================
  10. % Instructions: Compute the cost of a particular choice of theta
  11. % You should set J to the cost.
  12. J = sum(((X*theta)-y).^2)/(2*m);
  13. % =========================================================================
  14. end