setthres.m

来自「数据挖掘的工具箱,最新版的,希望对做这方面研究的人有用」· M 代码 · 共 43 行

function out = setthres(w,thr)
%SETTHRES Set the threshold for a one-class classifier
%
%     out = setthres(w,thr)
%
% The data of classifier w is copied to classifier out, only the
% threshold value is changed to thr.
%
%     thr = setthres(w)
%
% The current threshold can be retrieved by supplying just the
% classifier.
%
% DXD: There is a fundamental problem when the output of the classifier
% is transformed after the computation, for instance by sigm.m or by
% dist2dens. The threshold is applied to the original data, and not to
% the classifier output. Setting the threshold by hand, according to the
% classifier outputs will therefore NOT work! So therefore I'm sure if
% this is very useful...

% Copyright: D. Tax, R.P.W. Duin, [e-mail]
% Faculty of Applied Physics, Delft University of Technology
% P.O. Box 5046, 2600 GA Delft, The Netherlands

if ~isocc(w)
	error('setthres: I need a one-class classifier for this');
end

% Get the data:
W = +w;

% Return the threshold if that was the question
if nargin<2
	out = W.threshold;
	return
end

% Otherwise change the threshold:
W.threshold = thr;
out = setdata(w,W);

return