demo_linclass.m

很好的matlab模式识别工具箱

function result = demo_linclass(action,hfigure,varargin)
% DEMO_LINCLASS Demo on the algorithms learning linear classifiers.
%
% Synopsis:
%  demo_linclass
%
% Description:
%  DEMO_LINCLASS demonstrates use of the algorithms which find 
%  linear decision hyperplane between two (dichotomy)
%  vector sets. The demo requires 2D input training data.
%
%  The program vizualizes found hyperplane in the current 
%  algorithm step. The missclassified vector used by the
%  demonstrated iterative algorithms for update is vizualized
%  as well. Text description of the found solution is
%  printed at the bottom part of window.
%
%  Following algorithms can be tested:
%
%  Perceptron  - Perceptron learning rule (see 'help perceptron').
%  Kozinec     - Kozinec's algorithm (see 'help ekozinec', eps=-1). 
%  e-Kozinec   - Kozinec's algorithm finding eps-optimal hyperplane
%                (see 'help ekozinec', eps > 0).
%  Linear SVM   - Linear Supprot Vector Machines for separable data
%                (see 'help smo', C=inf, ker='linear').
%
% Control:
%  Algorithm  - Dselects algorithm for testing.
%  Epsilon    - Input parameter of 'ekozinec' algorithm 
%               (see 'help ekozinec').
%  Iterations - Number of iterations in one step.
%  Animation  - Enables/dissables animation - smooth changeover 
%               between two algorithm states.
%
%  FIG2EPS     - Exports screen to the PostScript file.
%  Load data   - Loads input training data from file.
%  Create data - Invokes program for creating training data.
%  Reset       - Sets the algorithm to the initial state.
%  Play        - Runs the algorithm.
%  Stop        - Stops the running algorithm.
%  Step        - Perform one step of the algorithm.
%  Info        - Invoke the info box.
%  Close       - Close the program.
%
% See also 
%  PERCEPTRON, EKOZINEC, SVM.
%

% About: Statistical Pattern Recognition Toolbox
% (C) 1999-2003, Written by Vojtech Franc and Vaclav Hlavac
% <a href="http://www.cvut.cz">Czech Technical University Prague</a>
% <a href="http://www.feld.cvut.cz">Faculty of Electrical Engineering</a>
% <a href="http://cmp.felk.cvut.cz">Center for Machine Perception</a>

% Modifications:
% 19-sep-2003, VF
% 17-Feb-2003, VF
% 24. 6.00 V. Hlavac, comments polished.
% 11-dec-2000 V. Franc, a little increasing of code readibility
% 15-dec-2000

LINE_WIDTH=1;        % width of separation line
ANIM_STEPS=10;       % number of steps during the line animation
BORDER=0.2;          % minimal space between axis and points
%DATA_IDENT='Finite sets, Enumeration';  % file identifier
ALGOS=['Perceptron';'Kozinec   ';'e-Kozinec ';  'LinearSVM '];
WRONGPOINT_SIZE = 13;

% if number of arguments is less then 1, that means first call of this
% function. Every other calls set up at least argument action
if nargin < 1,
   action = 'initialize';
end

% what action is required ?
switch lower(action)

case 'initialize'
   % == Initialize user interface control and figure =======

   % == Figure =============================================
   left=0.1;
   width=0.8;
   bottom=0.1;
   height=0.8;
   hfigure=figure('Name','Linear discriminant function', ...
      'Visible','off',...
    'NumberTitle','off', ...
      'Units','normalized', ...
      'Position',[left bottom width height],...
      'Units','normalized', ...
      'tag','Demo_Linclass',...
      'RendererMode','manual');

   % == Axes =========================================
   left=0.1;
   width=0.65;
   bottom=0.35;
   height=0.60;
   haxes1=axes(...
       'Units','normalized', ...
      'Box','on', ...
      'DrawMode','fast',...
      'UserData',[],...
      'Position',[left bottom width height]);
   xlabel('feature x_1');
   ylabel('feature x_2');

   % == Comment window =================================
   % Comment Window frame
   bottom=0.05;
   height=0.2;
   uicontrol( ...
        'Style','frame', ...
        'Units','normalized', ...
        'Position',[left bottom width height], ...
        'BackgroundColor',[0.5 0.5 0.5]);

   % Text label
   uicontrol( ...
        'Style','text', ...
        'Units','normalized', ...
        'Position',[left height-0.01 width 0.05], ...
        'BackgroundColor',[0.5 0.5 0.5], ...
        'ForegroundColor',[1 1 1], ...
        'String','Comment Window');

   % Edit window
   border=0.01;
   hconsole=uicontrol( ...
        'Style','edit', ...
        'HorizontalAlignment','left', ...
        'Units','normalized', ...
        'Max',10, ...
        'BackgroundColor',[1 1 1], ...
        'Position',[left+border bottom width-2*border height-0.05], ...
        'Enable','inactive',...
        'String','');


    % == Buttons ===========================================
    % -- Export to EPS ---------
   width=0.1;
   left=0.75-width;
   bottom=0.95;
   height=0.04;
   hbtclose = uicontrol(...
    'Units','Normalized', ...
      'Callback','fig2eps(gcf)',...
        'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'String','FIG2EPS');
   %----------------------------------

   % Close button
   left=0.8;
   bottom=0.05;
   height=0.05;
   width=0.15;
   hbtclose = uicontrol(...
    'Units','Normalized', ...
      'Callback','close(gcf)',...
        'ListboxTop',0, ...
        'Position',[left bottom width height], ...
        'String','Close');

   % Info button: call stanard info box
   bottom=bottom+1.5*height;
   hbtinfo = uicontrol(...
    'Units','Normalized', ...
      'Callback','demo_linclass(''info'',gcf)',...
        'ListboxTop',0, ...
        'Position',[left bottom width height], ...
        'String','Info');

   % Step button: perform one adaptation step
   bottom=bottom+1.5*height;
    hbtstep = uicontrol(...
      'Units','Normalized', ...
      'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'String','Step', ...
      'Callback','demo_linclass(''step'',gcf)');

   % Stop button: stop process of adaptation
   bottom=bottom+height;
   hbtstop = uicontrol(...
    'Units','Normalized', ...
        'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'String','Stop', ...
      'Callback','set(gcbo,''UserData'',1)',...
      'Enable','off');

   % Play button: start up adaptation
   bottom=bottom+height;
   hbtplay = uicontrol(...
    'Units','Normalized', ...
      'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'String','Play', ...
      'Callback','demo_linclass(''play'',gcf)');

   % Reset button: set up t = 0
   bottom=bottom+height;
    hbtreset = uicontrol(...
      'Units','Normalized', ...
      'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'String','Reset', ...
      'Callback','demo_linclass(''reset'',gcf)');

   % Creat data
   bottom=bottom+1.5*height;
    hbtcreat = uicontrol(...
      'Units','Normalized', ...
      'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'String','Create data', ...
      'Callback','demo_linclass(''creatdata'',gcf)');

   % Load data
   bottom=bottom+1*height;
    hbtload = uicontrol(...
      'Units','Normalized', ...
      'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'String','Load data', ...
      'Callback','demo_linclass(''getfile'',gcf)');

   % == Popup menus ======================================
   % Pop up menu for the selection between algorithms
    % title
   bottom=0.95-height;
   htxalgo=uicontrol( ...
      'Style','text', ...
      'Units','normalized', ...
      'Position',[left bottom width height], ...
      'String','Algorithm');
   % popup menu
   bottom=bottom-height;
   hpualgo=uicontrol( ...
      'Style','popup', ...
      'Units','normalized', ...
      'CallBack','demo_linclass(''epshandler'',gcf)',...
      'Position',[left bottom width height], ...
      'String',ALGOS);


   % == Edit line ========================================
   % epsilon
   bottom=bottom-1.2*height;
   htxeps=uicontrol( ...
      'Style','text', ...
      'Units','normalized', ...
      'Position',[left bottom width 0.9*height], ...
      'Enable','off',...
      'String','epsilon');
   bottom=bottom-height;
   hedeps = uicontrol(...
    'Units','normalized', ...
      'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'Style','edit',...
      'Enable','off',...
      'CallBack','demo_linclass(''epshandler'',gcf)',...
      'String','1e-2');

   % # of iterations
   bottom=bottom-1.1*height;
   htxiter=uicontrol( ...
      'Style','text', ...
      'Units','normalized', ...
      'Position',[left bottom width 0.9*height], ...
      'String','Iterations');

   bottom=bottom-0.9*height;
   hediter = uicontrol(...
    'Units','normalized', ...
      'ListboxTop',0, ...
        'Position',[left bottom width height], ...
      'Style','edit',...
      'CallBack','demo_linclass(''iterhandler'',gcf)',...
      'String','1');

   % == Check boxes ==============================================
   % Make check box to determine if a line will be drawn in one 
   % step or smooth plot.
   bottom=bottom-height*1.2;
    hxbanim = uicontrol(...
    'Style','checkbox', ...
    'Units','normalized', ...
    'ListboxTop',0, ...
    'Position',[left bottom width height], ...
    'String','Animation');

    % ============================================================
   % Store handlers
   handlers=struct(...
      'line',struct('handler',-1,'alpha',0,'theta',0,'t',0),...
      'btstep',hbtstep,...
      'btstop',hbtstop,...
      'btclose',hbtclose,...
      'btplay',hbtplay,...
      'btreset',hbtreset,...
      'btinfo',hbtinfo,...
      'btload',hbtload,...
      'btcreat',hbtcreat,...
      'pualgo',hpualgo,...
      'console',hconsole,...
      'editer',hediter,...
      'edeps',hedeps,...
      'txeps',htxeps,...
      'axes1',haxes1,...
      'xbanim',hxbanim);
   set(hfigure,'UserData',handlers)

   % Reset
   demo_linclass('reset',hfigure);

   % Put figure on desktop
   set(hfigure,'Visible','on');
   drawnow;

case 'iterhandler'
   % == Handler for edit line Iterations ===============
   h=get(hfigure,'UserData');

   iter=round(str2num(get(h.editer,'String')));
   if isempty(iter) | iter < 1, iter=1; end
   set(h.editer,'String',num2str(iter));


case 'epshandler'
   % == Handler for edit line Epsilon =======================
   h=get(hfigure,'UserData');

   % if algorithm e-Kozinec is selected then ...
   if get(h.pualgo,'Value')==3,
      set(h.edeps,'Enable','on');
      set(h.txeps,'Enable','on');

      epsil=str2num(get(h.edeps,'String'));
      if epsil < 0,
         epsil=1;
         set(h.edeps,'String',num2str(epsil));
      end
   else
      set(h.edeps,'Enable','off');
      set(h.txeps,'Enable','off');
   end


case 'creatdata'
   % == Invoke data set creator ================================
   createdata('finite',2,'demo_linclass','created',hfigure);


case 'created'
   % == Load new created data set =============================

   % get handler and make this figure active
   figure(hfigure);
   h=get(hfigure,'UserData');

   % get file name
   path=varargin{1};
   name=varargin{2};
   pathname=strcat(path,name);

%   if checkdat(pathname,DATA_IDENT,2,[0 0])==1,
   if check2ddata(pathname),
      file.pathname=pathname;
      file.path=path;
      file.name=name;
      set(h.btload,'UserData',file);
      demo_linclass('loadsets',hfigure);
      demo_linclass('reset',hfigure);
   else
      errordlg('This file does not contain required data.','Bad file','modal');
   end


case 'getfile'
   % == Invoke standard open file dialog ===================
   % Opens file and checks if contains appropriate data, 
   % if yes loads data.

   h=get(hfigure,'UserData');

   [name,path]=uigetfile('*.mat','Open file');
   if name~=0,
      file.pathname=strcat(path,name);
      file.path=path;
      file.name=name;
      if check2ddata(file.pathname),
%      if checkdat(file.pathname,DATA_IDENT,2,[0 0])==1,
         set(h.btload,'UserData',file);
         demo_linclass('loadsets',hfigure);