%
% An extension of example 9.1
% This illustrates the 1-D histogram using relative frequency and frequency.
% 
% Written by:
% -- 
% John L. Weatherwax                2005-08-14
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

load galaxy
% The 'hist' function can return the
% bin centers and frequencies.
% Use the default number of bins - 10.
% 
% run now with nBins=5,50
% 
nBins = 5; 
nBins = 50; 

[n, x] = hist(EastWest,nBins);
% Plot and use the argument of width = 1
% to get bars that touch.
bar(x,n,1,'w');
title('Frequency Histogram - Galaxy Data')
xlabel('Velocity')
ylabel('Frequency')


% Now create a relative frequency histogram.
% Divide each box by the total number of points.
bar (x,n/140,1,'w')
title('Relative Frequency Histogram - Galaxy Data')
xlabel('Velocity')
ylabel('Relative Frequency')