科研绘图完整复制01：机器学习回归问题常用验证图——散点密度/频率图画法-完整MATLAB代码及origin操作

Posted 2023-02-24 猫肚肚

画图基本思路：准备数据，画图

首先准备数据：

统计散点频率

%频率统计
x = chuntian(:,1);
y = chuntian(:,2);
%max(c(:,1))
Xedges = 0:500;
Yedges = 0:500;
N = histcounts2(x,y,Xedges,Yedges)
sum(sum(N))


x_cent_point = [0.5:1:499.5];
y_cent_point = [0.5:1:499.5];
n = 0;
for i = 1:500
    for j = 1:500
        n = n + 1;       
        x_p(n) = x_cent_point(i);
        y_p(n) = y_cent_point(j);
        z_p(n) = N(i,j);
    end
end

result = [x_p', y_p', z_p'];

保存结果result，EXCEL里去掉频数是0的行。