关于EntityFrameworkCore有三个重要的引用和三条重要的命令，掌握以这六条，基本用EntityFrameworkCore就得心应手了。引用1：Install-PackageMicrosoft.EntityFrameworkCore.SqlServer这是SqlServer的EntityFrameworkC...

cov11=sum((dim1-mean(dim1)).*(dim1-mean(dim1)))/(size(MySample,1)-1)cov11=296.7222>>std(dim1)ans=17.2256>>std(dim1).^2ans=296.7222 统计学里最基本的概念就是...