write_svm_data.m

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function make_svmdata(features, labels, filename)

%Make a BSVM-format data file from a features matrix 
%Inputs:
%	features - A matrix of features of size #features x #points
%  labels   - A vector of labels (targets) corresponding to the 
%				  number of points in the features matrix
%	filename - The name of the file to be created

if (size(features,2) ~= length(labels)),
   error('Features and labels do not match in length!');
end


fid = fopen(filename, 'w');
if (fid == -1),
   error('Could not open the file');
end

[c,r] = size(features);

for i = 1:r,
   %Write the label
   if (labels(i) < 1)
      fprintf(fid, '-1 ');
   else
      fprintf(fid, '+1 ');
   end
   for j=1:c,
      fprintf(fid, '%i:%f ', j, features(j,i));
   end
   fprintf(fid, char(13));
   fprintf(fid, char(10));
end

fclose(fid);