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function?[K]?=?kernel（kerxy）
%?Calculate?kernel?function.???
%
%?x:?輸入樣本d×n1的矩陣n1為樣本個數d為樣本維數
%?y:?輸入樣本d×n2的矩陣n2為樣本個數d為樣本維數
%
%?ker??核參數（結構體變量）
%?the?following?fields:
%???type???-?linear?:??k（xy）?=?x‘*y
%????????????poly???:??k（xy）?=?（x‘*y+c）^d
%????????????gauss??:??k（xy）?=?exp（-0.5*（norm（x-y）/s）^2）
%????????????tanh???:??k（xy）?=?tanh（g*x‘*y+c）
%???degree?-?Degree?d?of?polynomial?kernel?（positive?scalar）.
%???offset?-?Offset?c?of?polynomial?and?tanh?kernel?（scalar?negative?for?tanh）.
%???width??-?Width?s?of?Gauss?kernel?（positive?scalar）.
%???gamma??-?Slope?g?of?the?tanh?kernel?（positive?scalar）.
%
%?ker?=?struct（‘type‘‘linear‘）;
%?ker?=?struct（‘type‘‘ploy‘‘degree‘d‘offset‘c）;
%?ker?=?struct（‘type‘‘gauss‘‘width‘s）;
%?ker?=?struct（‘type‘‘tanh‘‘gamma‘g‘offset‘c）;
%
%?K:?輸出核參數n1×n2的矩陣

%-------------------------------------------------------------%

switch?ker.type
????case?‘linear‘
????????K?=?x‘*y;
????case?‘ploy‘
????????d?=?ker.degree;
????????c?=?ker.offset;
????????K?=?（x‘*y+c）.^d;
????case?‘gauss‘
????????
????????s?=?ker.width;
????????rows?=?size（x2）;
????????cols?=?size（y2）;???
????????tmp?=?zeros（rowscols）;
????????for?i?=?1:rows
????????????for?j?=?1:cols
????????????????tmp（ij）?=?norm（x（:i）-y（:j））;
????????????end
????????end????????
????????K?=?exp（-0.5*（tmp/s）.^2）;

????case?‘tanh‘
????????g?=?ker.gamma;
????????c?=?ker.offset;
????????K?=?tanh（g*x‘*y+c）;
????otherwise
????????K?=?0;
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2008-05-10?20:16??SVM_lzb1p0\
?????文件????????2008??2016-09-23?10:12??SVM_lzb1p0\kernel.m
?????文件??????290930??2006-12-31?22:56??SVM_lzb1p0\LIBSVM?a?Library?for?Support?Vector?Machines.pdf
?????文件????????2973??2016-09-23?10:12??SVM_lzb1p0\Main_SVC_C.m
?????文件????????3002??2016-09-23?10:12??SVM_lzb1p0\Main_SVC_Nu.m
?????文件????????2986??2016-09-23?10:12??SVM_lzb1p0\Main_SVM_One_Class.m
?????文件????????2907??2016-09-23?10:12??SVM_lzb1p0\Main_SVR_Epsilon.m
?????文件????????2899??2016-09-23?10:12??SVM_lzb1p0\Main_SVR_Nu.m
?????文件????????4567??2016-09-23?10:13??SVM_lzb1p0\svmSim.m
?????文件????????4540??2016-09-23?10:13??SVM_lzb1p0\svmTrain.m
?????文件????????7168??2008-05-10?20:16??SVM_lzb1p0\Thumbs.db
?????文件????????1347??2007-06-30?19:11??SVM_lzb1p0\工具箱說明.txt