随机子集数据后如何在R中写入剩余的数据帧 [英] How to write the remaining data frame in R after randomly subseting the data

问题描述

我从数据框中随机抽取了一个样本.但是我不知道如何获取剩余的数据框.

I took a random sample from a data frame. But I don't know how to get the remaining data frame.

df <- data.frame(x=rep(1:3,each=2),y=6:1,z=letters[1:6])

#select 3 random rows
df[sample(nrow(df),3)]

我想要的是将剩余的数据框与其他 3 行一起获取.

What I want is to get the remaining data frame with the other 3 rows.

推荐答案

sample 每次运行时都会设置一个随机种子，因此如果你想重现它的结果，你要么需要 set.seed 或将其结果保存在变量中.

sample sets a random seed each time you run it, thus if you want to reproduce its results you will either need to set.seed or save its results in a variable.

解决您的问题，您只需在索引前添加 - 即可获得数据集的其余部分.另外，如果您想选择行(与您的问题不同)，请不要忘记在 indx 后面添加一个逗号

Addressing your question, you simply need to add - before your index in order to get the rest of the data set. Also, don't forget to add a comma after the indx if you want to select rows (unlike in your question)

set.seed(1)
indx <- sample(nrow(df), 3)

你的子集

df[indx, ] 
#   x y z
# 2 1 5 b
# 6 3 1 f
# 3 2 4 c

剩余数据集

df[-indx, ]
#   x y z
# 1 1 6 a
# 4 2 3 d
# 5 3 2 e

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