function?[C?sigma]?=?dataset3Params（X?y?Xval?yval）
%EX6PARAMS?returns?your?choice?of?C?and?sigma?for?Part?3?of?the?exercise
%where?you?select?the?optimal?（C?sigma）?learning?parameters?to?use?for?SVM
%with?RBF?kernel
%???[C?sigma]?=?EX6PARAMS（X?y?Xval?yval）?returns?your?choice?of?C?and?
%???sigma.?You?should?complete?this?function?to?return?the?optimal?C?and?
%???sigma?based?on?a?cross-validation?set.
%

%?You?need?to?return?the?following?variables?correctly.
C?=?1;
sigma?=?0.3;
cc=[0.01?0.03?0.1?0.3?1?3?10?30];
ss=[0.01?0.03?0.1?0.3?1?3?10?30];
error=zeros（641）;
%?======================?YOUR?CODE?HERE?======================
%?Instructions:?Fill?in?this?function?to?return?the?optimal?C?and?sigma
%???????????????learning?parameters?found?using?the?cross?validation?set.
%???????????????You?can?use?svmPredict?to?predict?the?labels?on?the?cross
%???????????????validation?set.?For?example?
%???????????????????predictions?=?svmPredict（model?Xval）;
%???????????????will?return?the?predictions?on?the?cross?validation?set.
%
%??Note:?You?can?compute?the?prediction?error?using?
%????????mean（double（predictions?~=?yval））
%
for?i=1:length（cc）
????for?j=1:length（ss）
????????model=?svmTrain（X?ycc（i）?@（x1?x2）?gaussianKernel（x1?x2?ss（j）））;?
????????predict=svmPredict（model?Xval）;
????????error（（i-1）*8+j）=mean（double（predict?~=?yval））;
????end
end
[eindex]=min（error）;
ctmp=floor（index/8）;
stmp=rem（index8）;
C=cc（ctmp）;
sigma=ss（stmp）;


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

end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件???????1543??2015-12-16?19:12??ex6\dataset3Params.m

?????文件???????2154??2015-12-16?19:38??ex6\emailFeatures.m

?????文件????????393??2013-11-18?21:54??ex6\emailSample1.txt

?????文件???????1301??2013-11-18?21:54??ex6\emailSample2.txt

?????文件???????4128??2013-11-18?21:54??ex6\ex6.m

?????文件????????981??2013-11-18?21:54??ex6\ex6data1.mat

?????文件???????7604??2013-11-18?21:54??ex6\ex6data2.mat

?????文件???????6038??2013-11-18?21:54??ex6\ex6data3.mat

?????文件???????4593??2013-11-18?21:54??ex6\ex6_spam.m

?????文件????????707??2015-12-16?16:57??ex6\gaussianKernel.m

?????文件????????761??2013-11-18?21:54??ex6\getVocabList.m

?????文件???????1624??2015-04-02?16:08??ex6\lib\jsonlab\AUTHORS.txt

?????文件???????3862??2015-04-02?16:08??ex6\lib\jsonlab\ChangeLog.txt

?????文件????????881??2015-04-02?16:08??ex6\lib\jsonlab\jsonopt.m

?????文件???????1551??2015-04-02?16:08??ex6\lib\jsonlab\LICENSE_BSD.txt

?????文件??????18732??2015-04-02?16:08??ex6\lib\jsonlab\loadjson.m

?????文件??????15574??2015-04-02?16:08??ex6\lib\jsonlab\loadubjson.m

?????文件????????771??2015-04-02?16:08??ex6\lib\jsonlab\mergestruct.m

?????文件??????19369??2015-04-02?16:08??ex6\lib\jsonlab\README.txt

?????文件??????17462??2015-04-02?16:08??ex6\lib\jsonlab\savejson.m

?????文件??????16123??2015-04-02?16:08??ex6\lib\jsonlab\saveubjson.m

?????文件???????1094??2015-04-02?16:08??ex6\lib\jsonlab\varargin2struct.m

?????文件???????1195??2015-04-02?16:08??ex6\lib\makeValidFieldName.m

?????文件???????3734??2015-04-02?16:08??ex6\lib\submitWithConfiguration.m

?????文件????????323??2013-11-18?21:54??ex6\linearKernel.m

?????文件????????569??2013-11-18?21:54??ex6\plotData.m

?????文件???????9902??2013-11-18?21:54??ex6\porterStemmer.m

?????文件???????3939??2015-12-16?19:34??ex6\processEmail.m

?????文件????????396??2013-11-18?21:54??ex6\readFile.m

?????文件????????655??2013-11-18?21:54??ex6\spamSample1.txt

............此處省略17個(gè)文件信息