detreeexp52.m

支持向量机工具箱

global data textdata numobs
global  x y j quadclass tree
global dtnum dtnode dtclass 
 
[x,y] = meshgrid(0:3:100,0:3:100);
x = x(:);
y = y(:);
j = classify([x y],data(:,1:2),textdata);
gscatter(x,y,j,'grb','sod')
xlabel('Age');
ylabel('Risk Value');
quadclass = classify(data(:,1:2),data(:,1:2),textdata,'quadratic');
bad = ~strcmp(quadclass,textdata);
sum(bad) / numobs;
hold on;
plot(data(bad,1), data(bad,2), 'kx');
hold off;