R语言向量知识点及实例讲解

> v <- c(.295, .300, .250, .287, list(.102, .200, .303), recursive = T)
> v
[1] 0.295 0.300 0.250 0.287 0.102 0.200 0.303
> typeof(v)
[1] "double"

> v <- c(.295, .300, .250, .287, list(.102, .200, .303))
> v
[[1]]
[1] 0.295

[[2]]
[1] 0.3

[[3]]
[1] 0.25

[[4]]
[1] 0.287

[[5]]
[1] 0.102

[[6]]
[1] 0.2

[[7]]
[1] 0.303

> typeof(v)
[1] "list"

> (w <- 1:10)
 [1] 1 2 3 4 5 6 7 8 9 10
> length(w) <- 5
> w
[1] 1 2 3 4 5

w
[1] 1 2 3 4 5 NA NA NA NA NA`
``