matlab画图（直方图，曲线，散点图）

1. 比较直方图 function compare_bar(all, sub) close all; step = 2; x = [-10:step:10]; bar_num = size(x,2); hist_all = hist(all,x); hist_sub = hist(sub,x); rate = hist_sub./hist_all; y = [hist_all;hist_sub];

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