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Coursera機器學習的8個練習所有答案,自己寫的

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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.


predictions?=?X*theta;
sqrErrors?=?(predictions-y).^2;
J?=?1/(2*m)?*?sum(sqrErrors);


%?=========================================================================

end

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