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


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

end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件??????489928??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1.pdf
?????目錄???????????0??2017-12-05?14:23??machine-learning-ex1-linear?regression\ex1\
?????文件?????????740??2017-12-05?10:10??machine-learning-ex1-linear?regression\ex1\computeCost.m
?????文件?????????780??2017-12-05?14:09??machine-learning-ex1-linear?regression\ex1\computeCostMulti.m
?????文件????????3908??2017-03-20?13:50??machine-learning-ex1-linear?regression\ex1\ex1.m
?????文件????????4507??2017-12-05?15:32??machine-learning-ex1-linear?regression\ex1\ex1_multi.m
?????文件????????1359??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\ex1data1.txt
?????文件?????????657??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\ex1data2.txt
?????文件????????1365??2017-12-05?14:58??machine-learning-ex1-linear?regression\ex1\featureNormalize.m
?????文件?????????957??2017-12-05?10:48??machine-learning-ex1-linear?regression\ex1\gradientDescent.m
?????文件?????????981??2017-12-05?14:11??machine-learning-ex1-linear?regression\ex1\gradientDescentMulti.m
?????目錄???????????0??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\
?????目錄???????????0??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\
?????文件????????1624??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\AUTHORS.txt
?????文件????????3862??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\ChangeLog.txt
?????文件?????????881??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\jsonopt.m
?????文件????????1551??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\LICENSE_BSD.txt
?????文件???????18732??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\loadjson.m
?????文件???????15574??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\loadubjson.m
?????文件?????????771??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\mergestruct.m
?????文件???????19369??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\README.txt
?????文件???????17462??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\savejson.m
?????文件???????16123??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\saveubjson.m
?????文件????????1094??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\jsonlab\varargin2struct.m
?????文件????????1195??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\makeValidFieldName.m
?????文件????????5562??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\lib\submitWithConfiguration.m
?????文件?????????669??2017-12-05?15:31??machine-learning-ex1-linear?regression\ex1\normalEqn.m
?????文件????????6293??2017-12-05?14:23??machine-learning-ex1-linear?regression\ex1\octave-workspace
?????文件?????????982??2017-12-05?09:31??machine-learning-ex1-linear?regression\ex1\plotData.m
?????文件????????1876??2017-03-14?09:40??machine-learning-ex1-linear?regression\ex1\submit.m
?????文件????????3098??2017-12-06?14:37??machine-learning-ex1-linear?regression\ex1\test.m
............此處省略176個(gè)文件信息