点point (x0, y0) 投影到到直线line y = m*x+b 的 投影点 point(x1,y1).
x = linspace(-10,10,100);m = 1;b = 0;y = m*x+b;x0 = 1;y0 = 10;x1 = (m*y0+x0-m*b)/(m^2+1);y1 = (m^2*y0+m*x0+b)/(m^2+1);plot(x,y);hold on;scatter(x0,y0);scatter(x1,y1);xlim([-20 20]);ylim([-20 20]);axis equal数据统计：106个分类，5130个站点，16138篇资讯
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