D4-The basic knowledge of R programming language.png
下载R语言 https://mirrors.tuna.tsinghua.edu.cn/CRAN/
下载Rstudio https://www.rstudio.com/products/rstudio/download/
R-project https://mp.weixin.qq.com/s/G-LXN9P2HVLv9v0cvyFJMA
dir()
list.files()
+-*/
x<- 1+2
rm(b)#清除一个变量
rm(u,c) #清除多个变量
rm(list = ls()）#清空所有变量
history()#在history里双击命令就会重现于控制台大于号后面，可以修改后运行
plot(rnorm(50))
boxplot(iris$Sepal.Length~iris$Species,col = c("lightblue","lightyellow","lightpink"))
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