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function nb = nobias(ker) 
%NOBIAS returns true if SVM kernel has no implicit bias 
% 
%  Usage: nb = nobias(ker) 
% 
%  Parameters: ker - kernel type 
%               
%  Author: Steve Gunn (srg@ecs.soton.ac.uk) 
 
  if (nargin ~= 1) % check correct number of arguments 
     help nobias 
  else 
      
    switch lower(ker) 
      case {'linear','sigmoid'} 
%,'anovaspline1','anovaspline2','anovaspline3'} 
        nb = 1; 
      otherwise 
        nb = 0; 
    end 
 
  end