is_occ.m

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%IS_OCC True for one-class classifiers
%
% is_occ(w) returns true if the classifier w is a one-class classifier,
% outputting only classes 'target' and/or 'outlier' and having a
% structure with threshold stored.
%
% Only problem is when you have an empty oc-classifier, this will
% return false. I cannot help it:-(

% 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


function out = is_occ(w)

[d,lablist] = mapping(w);
switch size(lablist,1)
case 1
   out = strcmp(lablist,'target')|...
         strcmp(lablist,'target ')|...
         strcmp(lablist,'outlier');
case 2
   out = strcmp(lablist,['outlier';'target ']) | ...
         strcmp(lablist,['target ';'outlier']);
otherwise
   out = 0;
end

if out
  if isstruct(d)
    fn = fieldnames(d);
    out = out & sum(strcmp(fn,'threshold'));
  end
  if ~out
    warning('IS_OCC: Missing threshold field in OC classifier.');
  end
end

return