R与Rstudio的安装
首先要确保电脑用户名是英文的
下载地址
R:https://mirrors.tuna.tsinghua.edu.cn/CRAN/
Rstudio:https://www.rstudio.com/products/rstudio/download/
在Rstudio里运行代码
> dir()
[1] "（备份）heim2003.xlsx" "（备份）heim2003_1.xlsx"
加减乘除
image.png
赋值 <- 清除赋值rm(list = ls())
> a<-5
> a
[1] 5
> rm(list = ls())
> a
Error: object 'a' not found
