Starting Out: Becoming Familiar with R（笔记）

1、scan()：

1、sep = ','：以逗号分隔   

2、what = 'char' ：String类型

> data5 = scan(sep = ',', what = 'char') 
1: "Jan","Feb","Mar","Apr","May","Jun" 
7: "Jul","Aug","Sep","Oct","Nov","Dec" 
13: Read 12 items 
> data5 
[1] "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"

3、reading a File of Data from a disk: 

data6 = scan(file = 'test data.txt')

4、使用getwd()函数来显示当前工作目录

> getwd()
[1] "C:/Documents and Settings/Administrator/My Documents" 

5、使用setwd()函数更改当前目录:

> dir.create("E:/R_Files")
> setwd("E:/R_Files")
> getwd()
[1] "E:/R_Files"

6、dir() & list.files() 查看当前目录下的子目录和文件

7、ls()函数列出所有变量

file = 'C:/Users/Windows 10/Desktop/test.csv'
> ls()
[1] "file"

模糊搜索：

> ls(pattern = 'be') 
[1] "beetle.cca" "beta"       "bf.beta" 

8、移除对象：

rm(list) 
remove(list)