均值，方差，协方差，相关系数，协方差矩阵

value = [];
for w = 0:5:50
    x = 1:50;
    y = roundn(0.1*x+2+w*rand(1,size(x,2)),-2);
    plot(x,y,'bo');
    value = [value sum((x(1,:)-mean(x(1,:))).*(y(1,:)-mean(y(1,:))))/(size(x,2))];
    value = roundn(value,-2);
end

 

value = [];
coef = [];
for w = 0:5:50
　　x = 1:50;
　　y = x+w*rand(1,size(x,2));
　　plot(x,y,'bo');
　　coef = [coef sum((x(1,:)-mean(x(1,:))).*(y(1,:)-mean(y(1,:))))/(std(x)*std(y)*(size(x,2)))];
　　coef = roundn(coef,-2);
end

 

参考地址：https://blog.youkuaiyun.com/xiwan0902/article/details/72280352/