R语言生成各种数据

R语言生成各种数据

1.生成实数，起始值，末值，间隔
> seq(1, 5, 0.5)
[1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
> seq(length=9, from=1, to=5)
[1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
2.使用键盘生成数字
> z <- scan()
1: 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
10:
Read 9 items
> z
[1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
3.rep（）创建所有元素都相同的函数
> rep(1, 30)
[1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
4.创建连续的整数，以所给参数值结尾
> sequence(4:5)
[1] 1 2 3 4 1 2 3 4 5
> sequence(c(10,5))
[1] 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5
5.gl(）用于创建水平数，重复值确定的数值
> gl(3, 5)
[1] 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3
Levels: 1 2 3
> gl(3, 5, length=30)
[1] 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3
Levels: 1 2 3
> gl(2, 6, label=c("Male", "Female"))
[1] Male Male Male Male Male Male
[7] Female Female Female Female Female Female
Levels: Male Female
> gl(2, 10)
[1] 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2
Levels: 1 2
> gl(2, 1, length=20)
[1] 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2
Levels: 1 2
> gl(2, 2, length=20)
[1] 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2
Levels: 1 2
6.expand.grid()创建数据框
> expand.grid(h=c(60,80), w=c(100, 300), sex=c("Male", "Female"))
h w sex
1 60 100 Male
2 80 100 Male
3 60 300 Male
4 80 300 Male
5 60 100 Female
6 80 100 Female
7 60 300 Female
8 80 300 Female

7.随机有规律的数据（符合各种分布函数）