%EX_SUNS: Sunspot data analysis
%
echo off

% A. Swami April 15, 1995 
% Copyright (c) 1991-2001 by United Signals & Systems, Inc. 
%       $Revision: 1.6 $

%     RESTRICTED RIGHTS LEGEND
% Use, duplication, or disclosure by the Government is subject to
% restrictions as set forth in subparagraph (c) (1) (ii) of the 
% Rights in Technical Data and Computer Software clause of DFARS
% 252.227-7013. 
% Manufacturer: United Signals & Systems, Inc., P.O. Box 2374, 
% Culver City, California 90231. 
%
%  This material may be reproduced by or for the U.S. Government pursuant 
%  to the copyright license under the clause at DFARS 252.227-7013. 

clear, 
echo on

 load sunspot.dat             %  SUNSPOT data 
 sp=sunspot(:,2); 
 figno(1) = gcf; 
 clc
 subplot(211),  plot( 1:length(sp),sp), grid on 
 subplot(212), hist(sp), 
 set(gcf,'Name','sunspot data') 

%Hit any key to continue
pause  

% These are the annual sunspot counts for years 1700-1987
%   sunspot data are all positive valued;
%   differencing the data is useful in such cases 

 sp = diff(sp);   
 sp_txt = 'sunspot data (differenced)'; 
 ex_eda

echo on
%  End of sunspot demo
%  Hit any key to clear all plots, and return to previous menu
pause

echo off
for k=1:length(figno)
    close(figno(k))      % figno has figure numbers returned by ex_eda
end   
clear figno

return