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.


%for?i=1:m
?%???J=J+（theta‘*X（i:）‘-y（i））^2;
%end;
%J=J/（2*m）;

%h=X*theta-y;
%J=1/（2*m）*sum（h.^2）;
J=1/（2*m）*（X*theta-y）‘*（X*theta-y）;


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

end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-12-08?16:03??machine-learning-ex1\
?????目錄???????????0??2017-12-09?00:21??machine-learning-ex1\ex1\
?????文件??????162304??2017-12-08?15:48??machine-learning-ex1\ex1.doc
?????文件??????489928??2017-03-14?09:40??machine-learning-ex1\ex1.pdf
?????文件?????????766??2017-12-09?00:20??machine-learning-ex1\ex1\computeCost.m
?????文件?????????707??2017-12-09?00:47??machine-learning-ex1\ex1\computeCostMulti.m
?????文件????????3916??2017-12-08?20:32??machine-learning-ex1\ex1\ex1.m
?????文件????????1359??2017-03-14?09:40??machine-learning-ex1\ex1\ex1data1.txt
?????文件?????????657??2017-03-14?09:40??machine-learning-ex1\ex1\ex1data2.txt
?????文件????????4460??2017-03-14?09:40??machine-learning-ex1\ex1\ex1_multi.m
?????文件????????1342??2017-12-09?00:48??machine-learning-ex1\ex1\featureNormalize.m
?????文件????????1196??2017-12-09?00:01??machine-learning-ex1\ex1\gradientDescent.m
?????文件?????????982??2017-12-09?00:48??machine-learning-ex1\ex1\gradientDescentMulti.m
?????文件?????????102??2017-12-08?08:25??machine-learning-ex1\ex1\hello.txt
?????目錄???????????0??2017-12-08?02:11??machine-learning-ex1\ex1\lib\
?????目錄???????????0??2017-12-08?02:11??machine-learning-ex1\ex1\lib\jsonlab\
?????文件????????1624??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\AUTHORS.txt
?????文件????????3862??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\ChangeLog.txt
?????文件?????????881??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\jsonopt.m
?????文件????????1551??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\LICENSE_BSD.txt
?????文件???????18732??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\loadjson.m
?????文件???????15574??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\loadubjson.m
?????文件?????????771??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\mergestruct.m
?????文件???????19369??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\README.txt
?????文件???????17462??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\savejson.m
?????文件???????16123??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\saveubjson.m
?????文件????????1094??2017-03-14?09:40??machine-learning-ex1\ex1\lib\jsonlab\varargin2struct.m
?????文件????????1195??2017-03-14?09:40??machine-learning-ex1\ex1\lib\makeValidFieldName.m
?????文件????????5562??2017-03-14?09:40??machine-learning-ex1\ex1\lib\submitWithConfiguration.m
?????文件??????????30??2017-12-08?08:21??machine-learning-ex1\ex1\new.txt
?????文件?????????665??2017-12-09?00:49??machine-learning-ex1\ex1\normalEqn.m
............此處省略4個文件信息