function h = plot_two_labels(xdata,ydata,lab1,lab2)
% PLOT_LABELED - Plots the samples with symbols depending on one class label and colors depending on another
%   
% Written by:
% -- 
% John L. Weatherwax                2008-11-05
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

color_choice   = 'bgrcmykw'; 
symbols_choice = 'ox+*sdv.';
n_choices      = length(color_choice); 

lab1_u = unique(lab1); 
n_lab1 = length(lab1_u); 
lab2_u = unique(lab2); 
n_lab2 = length(lab2_u); 
h = figure; hold on; 
for li1=1:n_lab1,
  cl1 = lab1_u(li1); 
  for li2=1:n_lab2, 
    cl2        = lab2_u(li2); 
    inds       = find( (lab1==cl1) & (lab2==cl2) );
    sym_ind_bm = sub2ind( [n_lab1,n_lab2], li1, li2 ); 
    sym_ind    = mod(sym_ind_bm-1,n_choices)+1;
    plot( xdata(inds), ydata(inds), [color_choice(sym_ind),symbols_choice(sym_ind)], 'MarkerSize', 12, 'MarkerFaceColor', color_choice(sym_ind) ); 
  end
end