91、R语言编程基础

1、查看当前工作空间

> getwd()
[1] "C:/Users/P0079482.HHDOMAIN/Documents"
> 

2、查看内存中有哪些对象

> ls()
 [1] "a"         "a1"        "b"         "bank"      "bank_full" "dat"
 [7] "m1"        "tab"       "w"         "x"         "x1"        "x2"
> 

3、把指定对象从内存中删除

> rm(‘a‘)
> ls()
 [1] "a1"        "b"         "bank"      "bank_full" "dat"       "m1"
 [7] "tab"       "w"         "x"         "x1"        "x2"
> 

4、查看函数帮助

> help(matrix)
> 

5、创建向量和矩阵

> x1=c(2,4,6,8,0)
> x2=c(1,3,5,7,9)查看向量的长度
> length(x1)
[1] 5查看向量的类型
> mode(x1)
[1] "numeric"
> 

6、按行将向量排列成矩阵

> rbind(x1,x2)
[,1] [,2] [,3] [,4] [,5]
x1 2 4 6 8 0
x2 1 3 5 7 9