感知器算法----Matlab实现

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data=[0 0 -1;0 1 1 ; -1 0 1 ; 1 1 -1];X = data(:, [1, 2]); y = data(:, 3);m = size(X,1); plotData2(X,y);X = [ones(m,1) X];error = 1;W=[0;0;0];first = 1;tim=0;alph=0.1;hold onaxis([-2 2 -2 2]);x1=-2:0.2:2;while error>0  error=0;   for i = 1:m     if ( ((W'*(X(i,:)'))*y(i) <= 0 )|| (first == 1) )         first=0;         error=error+1;         tim=tim+1;         W = W + alph*(X(i,:))'*y(i);         fprintf('%d\n',tim);         if W(3)~=0 && W(2)~=0            y1=-(W(1)/W(3)+W(2)*x1/W(3));            plot(x1,y1,'-b');          end;      end;     end; end; if W(3)~=0 && W(2)~=0    y1=-(W(1)/W(3)+W(2)*x1/W(3));    plot(x1,y1,'r');  end; hold off function plotData2(X, y)figure; hold on;pos = find(y==1) ;neg = find(y==-1);fprintf('%d\n\n',pos);fprintf('%d\n',neg);% Plot Examplesplot(X(pos, 1), X(pos, 2), 'k+','LineWidth', 2, ...     'MarkerSize', 9);plot(X(neg, 1), X(neg, 2), 'ko', 'MarkerFaceColor', 'r', ...     'MarkerSize', 7);hold off;end

效果是这样的：

权值为：

-0.100000000000000
-0.300000000000000
0.200000000000000

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