Question

我想在列中重复值，这些值可能没有相同的重复量。

例如，我想创建一个名为“Week”的列，其中我将“第1周”重复10次，然后“第2周”重复20次，然后“第3周”重复30次。

现在我正在使用此代码，但它只允许我重复每个“周＃”相同的次数。

df$Week <- rep(c("Week 1", "Week 2", "Week 3"), each = 10)

在这个例子中，我有第1周重复3次，第2周重复5次，第3周重复7次。我如何具体重复特定值的次数？

     X   Week  
 1  1.00 Week 1
 2  2.00 Week 1
 3  3.00 Week 1
 4  4.00 Week 2
 5  5.00 Week 2
 6  6.00 Week 2
 7  7.00 Week 2
 8  8.00 Week 2
 9  9.00 Week 3
10 10.0  Week 3
11 11.0  Week 3
12 12.0  Week 3
13 13.0  Week 3
14 14.0  Week 3
15 15.0  Week 3

Answer 1

如何确定特定值重复的次数？

times 参数。来自?rep：

times 一个整数值向量，给出（非负）次数，重复每个元素，如果长度为length(x)，或重复整个向量，如果长度为1

> rep(c("Week 1", "Week 2", "Week 3"), times = c(10, 20, 30))
# repeats "Week 1" 10 times, "Week 2" 20 times, "Week 3" 30 times

Answer 2

试试这个解决方案：

一周的通用列表

weeks<-c("Week 1", "Week 2", "Week 3")

从字符串中提取重复次数

repetition<-as.numeric(unlist(strsplit(weeks," "))[seq(2,length(weeks)*2,by=2)])*10

重复字符串

Week<-rep(weeks,repetition)
Week
 [1] "Week 1" "Week 1" "Week 1" "Week 1" "Week 1" "Week 1" "Week 1" "Week 1" "Week 1" "Week 1" "Week 2"
[12] "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2"
[23] "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 2" "Week 3" "Week 3" "Week 3"
[34] "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3"
[45] "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3" "Week 3"
[56] "Week 3" "Week 3" "Week 3" "Week 3" "Week 3"

将信息添加到data.frame

df$Week<-Week

使用不等数量的值重复列

2 个答案: