detreeexp32.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(1.3:.02:2,30:2:100);
x = x(:);
y = y(:);
j = classify([x y],data(:,1:2),textdata);
gscatter(x,y,j,'grb','sod')
xlabel('Head-Width(毫米)');
ylabel('Weight(毫克)');
quadclass = classify(data(:,1:2),data(:,1:2),textdata,'quadratic');
bad_q = ~strcmp(quadclass,textdata);
numobs = size(data,1);
sum(bad_q) / numobs;
hold on;
plot(data(bad_q,1), data(bad_q,2), 'kx');
hold off;