plotboundary2.m

来自「SVM数据挖掘分类实验系统」· M 代码 · 共 12 行

function [x11, x22, x1x2out] = plotboundary2(net, x1ran, x2ran)
% 画决策边界

hold on;
x1=-1:.02:1;x2=-1:.02:1;
[x11, x22] = meshgrid(x1, x2);                         %画三维矩阵图
[dummy, x1x2out] = svmfwd(net, [x11(:),x22(:)]);
x1x2out = reshape(x1x2out, [length(x1) length(x2)]);
contour(x11, x22, x1x2out, [-0.99 -0.99], 'b-');       %用蓝色划线标记下边界
contour(x11, x22, x1x2out, [0 0], 'k-');               %黑色划线标记决策边界
contour(x11, x22, x1x2out, [0.99 0.99], 'y-');         %黄色划线标记上边界