function?[bestaccbestcbestg]?=?SVMcgForClass（train_labeltraincmincmaxgmingmaxvcstepgstepaccstep）

%SVMcg?cross?validation?by?faruto

%

%?by?faruto

%Email:patrick.lee@foxmail.com?QQ:516667408?http://blog.sina.com.cn/faruto?BNU

%last?modified?2010.01.17


%%?若轉載請注明：

%?faruto?and?liyang??LIBSVM-farutoUltimateVersion?

%?a?toolbox?with?implements?for?support?vector?machines?based?on?libsvm?2009.?

%?

%?Chih-Chung?Chang?and?Chih-Jen?Lin?LIBSVM?:?a?library?for

%?support?vector?machines?2001.?Software?available?at

%?http://www.csie.ntu.edu.tw/~cjlin/libsvm

%%?about?the?parameters?of?SVMcg?

if?nargin?
????accstep?=?4.5;

end

if?nargin?
???cstep?=?0.8;

????gstep?=?0.8;

end
if?nargin?
????v?=?5;

end

if?nargin?
????gmax?=?8;

????gmin?=?-8;

end

if?nargin?
????cmax?=?8;

????cmin?=?-8;

end

%%?X:c?Y:g?cg:CVaccuracy

[XY]?=?meshgrid（cmin:cstep:cmaxgmin:gstep:gmax）;

[mn]?=?size（X）;

cg?=?zeros（mn）;



eps?=?10^（-4）;



%%?record?acc?with?different?c?&?gand?find?the?bestacc?with?the?smallest?c

bestc?=?1;

bestg?=?0.1;

bestacc?=?0;

basenum?=?2;

for?i?=?1:m

????for?j?=?1:n

????????cmd?=?[‘-v?‘num2str（v）‘?-c?‘num2str（?basenum^X（ij）?）‘?-g?‘num2str（?basenum^Y（ij）?）];

????????cg（ij