摘要：The renv package is a new effort to bring project-local R dependency management to your projects. There are three commands to do it. ·renv::init()·, i 阅读全文

摘要：1.3.4.1 Automatic Drawing Layout>Energy>Starting positions relocation technique limitations results depend on the starting positions of vertices it st 阅读全文

摘要：When I use the rstudio, it often prompts me a very long tip for me. It hinders me to write some comands. Thus, I use `export PS1=“$”` to short the tip 阅读全文

摘要：This is my first time to use renv package. I want it can help me to keep the enivronment clean and robust. library(renv) When I run the command, which 阅读全文

摘要：1.服务器身份验证 2.允许远程连接 3.服务器配置允许远程连接 4.sa登录密码 5.登录数据库引擎 6.服务器配置管理，服务允许状态 注意的事情就是中文要使用nvarchar 阅读全文

摘要：Lasso回归是一种比较常见的回归，它是线性回归的一种，这种回归使用了一种收缩（shrinkage）的技术。收缩是数据朝着中心值进行压缩的行为。其全程为Least Absolute Shrinkage and Selection Operator，翻译为中文就是最小绝对收缩和运算符选择。 Lasso回归产生一种简单稀疏的回归。这种回归特别适合于共线性情况比较厉害的情况。 Lasso回归的方程是... 阅读全文

摘要：换源，将源切换到中国 具体方法是： options(repos=structure(c(CRAN="https://mirrors.tuna.tsinghua.edu.cn/CRAN/"))) 阅读全文