function?auc?=?plotroc（yxparams）
%plotroc?draws?the?recevier?operating?characteristic（ROC）?curve.
%
%auc?=?plotroc（training_label?training_instance?[?libsvm_options?-v?cv_fold]）?
%??Use?cross-validation?on?training?data?to?get?decision?values?and?plot?ROC?curve.
%
%auc?=?plotroc（testing_label?testing_instance?model）?
%??Use?the?given?model?to?predict?testing?data?and?obtain?decision?values
%??for?ROC
%
%?Example:
%???
%?	load（‘heart_scale.mat‘）;?
%?	plotroc（heart_scale_label?heart_scale_inst‘-v?5‘）;
%
%	[yx]?=?libsvmread（‘heart_scale‘）;
%???	model?=?svmtrain（yx）;
%?	plotroc（yxmodel）;
	rand（‘state‘0）;?%?reset?random?seed
	if?nargin?		help?plotroc
		return
	elseif?isempty（y）?|?isempty（x）
		error（‘Input?data?is?empty‘）;
	elseif?sum（y?==?1）?+?sum（y?==?-1）?~=?length（y）
		error（

?屬性????????????大小?????日期????時(shí)間???名稱
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?????文件???????3047??2015-03-16?22:44??plotroc.m

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?????????????????3047????????????????????1