% REFRESH
      set(big_circle,'facecolor',nnltyell);
      set(big_cross,'color',nndkblue);
      for j=1:3
        if j ~= i
          set(WV(j),'color',colors(j,:));
        end
      end
      a = compet(W*P);
      [ai,aj] = find(a);
      for i=1:size(ai,1)
        set(PV(i),'color',colors(ai(i),:));
      end

    % NEW INPUT VECTOR
    else
      pv = plot(x,y,'.',...
        'color',nndkblue,...
        'markersize',25,...
        'erasemode','none');
      PV = [PV; pv];
      P = [P [x; y]];

      % REFRESH
      set(big_circle,'facecolor',nnltyell);
      set(big_cross,'color',nndkblue);
      for i=1:3
        set(WV(i),'color',colors(i,:));
      end
      a = compet(W*P);
      [ai,aj] = find(a);
      for i=1:size(ai,1)
        set(PV(i),'color',colors(ai(i),:));
      end
    end

  end

  % SET DATA
  set(fig,'nextplot','new')
  set(PV_ptr,'userdata',PV);
  set(P_ptr,'userdata',P);
  set(WV_ptr,'userdata',WV);
  set(W_ptr,'userdata',W);

%==================================================================
% Button up.
%
% ME('up')
%==================================================================

elseif strcmp(cmd,'up') & (fig) & (nargin == 2)
  
  % INDEX
  i = arg1;

  % FIND CLICK POSITION
  axes(big_axis)
  pt = get(big_axis,'currentpoint');
  x = pt(1);
  y = pt(3);
  length = sqrt(x^2 + y^2);

  % GET DATA
  PV = get(PV_ptr,'userdata');
  P = get(P_ptr,'userdata');
  WV = get(WV_ptr,'userdata');
  W = get(W_ptr,'userdata');
  set(fig,'nextplot','add')
  axes(big_axis);

  % NORMALIZE
  angle = atan2(y,x);
  deg5 = 5*pi/180;
  angle = round(angle/deg5)*deg5;
  length = sqrt(sum(x^2 + y^2));
  if length < 1.1
    length = min(length,1);
  end
  x = cos(angle)*length;
  y = sin(angle)*length;
  p = [x;y];

  if length <= 1
    delete(WV(i));
    W(i,:) = [x y];
    WV(i) = nndrwvec(W(i,1),W(i,2),2,0.05,colors(i,:),'','none');
  else
    set(WV(i),'color',colors(i,:));
  end
  set(fig,...
     'windowbuttonupfcn','',...
     'pointer','arrow')

  % REFRESH
  set(big_circle,'facecolor',nnltyell);
  set(big_cross,'color',nndkblue);
  for i=1:3
    set(WV(i),'color',colors(i,:));
  end
  a = compet(W*P);
  [ai,aj] = find(a);
  for i=1:size(ai,1)
    set(PV(i),'color',colors(ai(i),:));
  end

  % SET DATA
  set(fig,'nextplot','new')
  set(PV_ptr,'userdata',PV);
  set(WV_ptr,'userdata',WV);
  set(W_ptr,'userdata',W);

%==================================================================
% Button down.
%
% ME('learn')
%==================================================================

elseif strcmp(cmd,'learn') & (fig) & (nargin == 1)
  
  % GET DATA
  PV = get(PV_ptr,'userdata');
  P = get(P_ptr,'userdata');
  WV = get(WV_ptr,'userdata');
  W = get(W_ptr,'userdata');
  axes(big_axis);
  set(fig,'nextplot','add')
  lr = get(lr_bar,'value');

  i = floor(rand*size(PV,1))+1;
  p = P(:,i);

  % SHOW INPUT
  nnpause(0.5);
  set(fig,'nextplot','add');
  temp_circle = plot(p(1),p(2),'.',...
    'color',nndkblue,...
    'markersize',32,...
    'erasemode','none');
  set(PV(i),'color',nnwhite);
  nnpause(0.5);

  % CALCULATE NEW WEIGHT
  a = compet(W*p);
  i = find(a);
  newW = W + (lr*a*ones(1,2)).*(ones(3,1)*p'-W);

  temp1 = plot([W(i,1) p(1)],[W(i,2) p(2)],'--',...
    'color',nndkblue,...
    'erasemode','none');
  temp2 = nndrwvec([W(i,1) newW(i,1)],[W(i,2) newW(i,2)],2,0.05,nndkblue,'','none');
  nnpause(0.5);
  W = newW;

  % MOVE WEIGHT
  set(WV(i),'color',nnltyell);
  set(temp1,'color',nnltyell);
  set(temp2,'color',nnltyell);
  delete(WV(i));
  delete(temp1);
  delete(temp2);

  set(big_cross,'color',nndkblue);
  WV(i) = nndrwvec(W(i,1),W(i,2),2,0.05,colors(i,:),'','none');
  nnpause(0.5);

  % REFRESH
  delete(temp_circle);
  set(big_circle,'facecolor',nnltyell);
  set(big_cross,'color',nndkblue);
  for i=1:3
    set(WV(i),'color',colors(i,:));
  end
  a = compet(W*P);
  [ai,aj] = find(a);
  for i=1:size(ai,1)
    set(PV(i),'color',colors(ai(i),:));
  end

  % SET DATA
  set(fig,'nextplot','new')
  set(WV_ptr,'userdata',WV);
  set(W_ptr,'userdata',W);

%==================================================================
% Button down.
%
% ME('train')
%==================================================================

elseif strcmp(cmd,'train') & (fig) & (nargin == 1)

  nnpause(0.5);
  for xx=1:5
  
  % GET DATA
  PV = get(PV_ptr,'userdata');
  P = get(P_ptr,'userdata');
  WV = get(WV_ptr,'userdata');
  W = get(W_ptr,'userdata');
  axes(big_axis);
  set(fig,'nextplot','add')
  lr = get(lr_bar,'value');

  i = floor(rand*size(PV,1))+1;
  p = P(:,i);

  % SHOW INPUT
  set(fig,'nextplot','add');
  temp_circle = plot(p(1),p(2),'.',...
    'color',nndkblue,...
    'markersize',32,...
    'erasemode','none');
  set(PV(i),'color',nnwhite);
  nnpause(1);

  % CALCULATE NEW WEIGHT
  a = compet(W*p);
  i = find(a);
  newW = W + (lr*a*ones(1,2)).*(ones(3,1)*p'-W);

  temp1 = plot([W(i,1) p(1)],[W(i,2) p(2)],'--',...
    'color',nndkblue,...
    'erasemode','none');
  temp2 = nndrwvec([W(i,1) newW(i,1)],[W(i,2) newW(i,2)],2,0.05,nndkblue,'','none');
  nnpause(0.5);
  W = newW;

  % MOVE WEIGHT
  set(WV(i),'color',nnltyell);
  set(temp1,'color',nnltyell);
  set(temp2,'color',nnltyell);
  delete(WV(i));
  delete(temp1);
  delete(temp2);

  set(big_cross,'color',nndkblue);
  WV(i) = nndrwvec(W(i,1),W(i,2),2,0.05,colors(i,:),'','none');
  nnpause(0.5);

  % REFRESH
  delete(temp_circle);
  set(big_circle,'facecolor',nnltyell);
  set(big_cross,'color',nndkblue);
  for i=1:3
    set(WV(i),'color',colors(i,:));
  end
  a = compet(W*P);
  [ai,aj] = find(a);
  for i=1:size(ai,1)
    set(PV(i),'color',colors(ai(i),:));
  end

  % SET DATA
  set(fig,'nextplot','new')
  set(WV_ptr,'userdata',WV);
  set(W_ptr,'userdata',W);

  nnpause(0.5);
  set(fig,'nextplot','new');

  end

%==================================================================
% Respond to learning rate slider.
%
% ME('lr')
%==================================================================

elseif strcmp(cmd,'lr')
  
  lr = get(lr_bar,'value');
  set(lr_text,'string',sprintf('%5.2f',round(lr*10)*0.1))

%==================================================================
% Clear input vectors.
%
% ME('random')
%==================================================================

elseif strcmp(cmd,'random') & (fig) & (nargin == 1)
  
  % GET DATA
  PV = get(PV_ptr,'userdata');
  P = get(P_ptr,'userdata');
  WV = get(WV_ptr,'userdata');
  axes(big_axis);
  set(fig,'nextplot','add')

  delete(WV);
  set(big_circle,'facecolor',nnltyell);
  set(big_cross,'color',nndkblue);
  set(PV,'color',nndkblue);

  angle = rand(1,3)*2*pi;
  WV = [];
  for i=1:3
    W(i,:) = [cos(angle(i)) sin(angle(i))];
    WV(i) = nndrwvec(W(i,1),W(i,2),2,0.05,colors(i,:),'','none');
    set(WV(i),'color',colors(i,:));
  end

  % REFRESH
  set(big_circle,'facecolor',nnltyell);
  set(big_cross,'color',nndkblue);
  for i=1:3
    set(WV(i),'color',colors(i,:));
  end
  a = compet(W*P);
  [ai,aj] = find(a);
  for i=1:size(ai,1)
    set(PV(i),'color',colors(ai(i),:));
  end

  % SET DATA
  set(fig,'nextplot','new')
  set(W_ptr,'userdata',W);
  set(WV_ptr,'userdata',WV);
end