Daniel@0: function w = svmlight2weight(modelfile)
Daniel@0: % returns the dual weight vecor for a given svm model
Daniel@0: %
Daniel@0: % All the script does is compute the weighted sum of the support vectors
Daniel@0: % (first element in line is alpha*y, what follows is the feature vector).
Daniel@0: % For further info, see the comment in the model file for its format. 
Daniel@0: 
Daniel@0: tagstr = python('svmlight2weight.py', modelfile);
Daniel@0: 
Daniel@0: [firstidx] = strfind(tagstr, '1 :');
Daniel@0: 
Daniel@0: %get start of vector description
Daniel@0: tagstr = tagstr(firstidx:end);
Daniel@0: 
Daniel@0: % parse text function output
Daniel@0: vecs = textscan(tagstr,'%d %f','Delimiter',':');
Daniel@0: 
Daniel@0: % initialise
Daniel@0: w = zeros(max(vecs{1}),1);
Daniel@0: 
Daniel@0: % set values
Daniel@0: w(vecs{1}) = vecs{2};
Daniel@0: