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;
J?=?1/（2*m）*（predictions?-?y）‘*（predictions?-?y）;
%?=========================================================================

end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2015-10-11?20:21??machine-learning-ex1\
?????目錄???????????0??2015-10-12?19:40??machine-learning-ex1\ex1\
?????文件?????????702??2015-10-12?16:44??machine-learning-ex1\ex1\computeCost.m
?????文件?????????706??2015-10-12?19:29??machine-learning-ex1\ex1\computeCostMulti.m
?????文件????????3438??2015-10-12?14:22??machine-learning-ex1\ex1\ex1.m
?????文件????????4469??2015-10-12?19:38??machine-learning-ex1\ex1\ex1_multi.asv
?????文件????????4493??2015-10-12?19:39??machine-learning-ex1\ex1\ex1_multi.m
?????文件????????1359??2013-11-08?06:43??machine-learning-ex1\ex1\ex1data1.txt
?????文件?????????657??2013-11-08?06:43??machine-learning-ex1\ex1\ex1data2.txt
?????文件????????1414??2015-10-12?19:13??machine-learning-ex1\ex1\featureNormalize.m
?????文件????????1103??2015-10-12?16:59??machine-learning-ex1\ex1\gradientDescent.m
?????文件????????1173??2015-10-12?19:32??machine-learning-ex1\ex1\gradientDescentMulti.m
?????目錄???????????0??2015-10-11?20:21??machine-learning-ex1\ex1\lib\
?????目錄???????????0??2015-10-11?20:21??machine-learning-ex1\ex1\lib\jsonlab\
?????文件????????1624??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\AUTHORS.txt
?????文件????????3862??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\ChangeLog.txt
?????文件????????1551??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\LICENSE_BSD.txt
?????文件???????19369??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\README.txt
?????文件?????????881??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\jsonopt.m
?????文件???????18732??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\loadjson.m
?????文件???????15574??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\loadubjson.m
?????文件?????????771??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\mergestruct.m
?????文件???????17462??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\savejson.m
?????文件???????16123??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\saveubjson.m
?????文件????????1094??2015-02-27?15:12??machine-learning-ex1\ex1\lib\jsonlab\varargin2struct.m
?????文件????????1195??2015-02-27?15:12??machine-learning-ex1\ex1\lib\makeValidFieldName.m
?????文件????????3734??2015-04-03?07:05??machine-learning-ex1\ex1\lib\submitWithConfiguration.m
?????文件?????????667??2015-10-12?19:34??machine-learning-ex1\ex1\normalEqn.m
?????文件????????1047??2015-10-11?22:30??machine-learning-ex1\ex1\plotData.m
?????文件????????1876??2015-04-25?07:54??machine-learning-ex1\ex1\submit.m
?????文件?????????513??2015-10-11?22:11??machine-learning-ex1\ex1\warmUpExercise.m
............此處省略1個文件信息