r - 将 1,2 或 3 随机分配给唯一的字符串

Question

我有一个字符向量，我想为字符向量中的每个字符串随机分配数字类别 1、2 或 3。我怎么能在 R 中做到这一点

输入

Species
Species1 
Species2
Species3
Species4
Species5

示例输出

Species   Category
Species1  2
Species2  1 
Species3  1
Species4  3
Species5  3

标签： rrandom

Answer 1

使用sample：

set.seed(2020)
df$Category <- sample(3, nrow(df), replace = TRUE)
df

#   Species Category
#1 Species1        3
#2 Species2        2
#3 Species3        1
#4 Species4        1
#5 Species5        2

数据

df <- structure(list(Species = structure(1:5, .Label = c("Species1", 
"Species2", "Species3", "Species4", "Species5"), class = "factor")), 
class = "data.frame", row.names = c(NA, -5L))