function p = pdfplotbins(c,w,bins,color,flag);
% function p = pdfplotbins(c,w,bins,color,flag);
% plot the pdf of distribution c with given bins
% If 'flag' argument is given then the matlab 'plot' command is used instead of 'bars'

% Copyright (c) 2004-2006 Alessio Botta, Alberto Dainotti, Antonio Pescapè
% Email: {a.botta , alberto , pescape }@unina.it
% DIS - Dipartimento di Informatica e Sistemistica 
% University of Napoli Federico II, ITALY
% All rights reserved.
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions
% are met:
% 1. Redistributions of source code must retain the above copyright
%    notice, this list of conditions and the following disclaimer.
% 2. Redistributions in binary form must reproduce the above copyright
%    notice, this list of conditions and the following disclaimer in the
%    documentation and/or other materials provided with the distribution.
% 3. Redistributions of source code or in binary form must clearly reproduce
%    the reference to the web site from which they were downloaded.
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% THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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% use hist to compute absolute frequencies 
freq=hist(c,bins);
% return relative frequencies
%p=freq/(length(c)); 
p=freq/(length(c)*w);

%plot
if nargin > 4
    plot(bins,p,color);
    grid minor;
else
	if nargin > 3
  	  bar(bins,p,color);
   	 grid minor;
	end
end