学习小组Days5笔记--CY

R语言学习网址和图书（引自生信星球）

1.官网：https://www.r-project.org/
2.CRAN：https://cran.r-project.org/
3.书籍：R语言实战（第2版）
4.腾讯课堂自行搜索入门课程

RStudio features（引自RStudio）

RStudio is an integrated development environment (IDE) for the R programming language. Some of its features include:

• Customizable workbench with all of the tools required to work with R in one place (console, source, plots, workspace, help, history, etc.).
• Syntax highlighting editor with code completion.
• Execute code directly from the source editor (line, selection, or file).
• Full support for authoring Sweave and TeX documents.
• Runs on all major platforms (Windows, Mac, and Linux) and can also be run as a server, enabling multiple users to access the RStudio IDE using a web browser. project website.

RStudio.png

下图引自生信星球

RStudio.png

R命令

1.1随机数的产生runif

语法：runif(n,min=0,max=1) n表示生成的随机数数量，min表示均匀分布的下限，max表示均匀分布的上限；若省略参数min、max,则默认生成[0,1]上的均匀分布随机数。

> plot(runif(50))  #默认产生50个0到1之间分布均匀的随机数，并绘图

1.2查看和设置工作目录

> getwd() # 查看工作目录
>setwd(dir=""C:/Users/Administrator/Documents"") #设置工作目录

1.3显示目录文件

dir()
list.flies()

dir.png

1.4赋值

8->x       #8赋值x
9->y       # 9赋值y
u<-2
sum(x,y)   #求和x+y
rm(x,u)    #删除对象

刚刚入门还有很多需要学习，加油！