根据R中的条件创建重复的行 [英] Create duplicate rows based on conditions in R
本文介绍了根据R中的条件创建重复的行的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个数据表,看起来像这样
I have a data.table that looks like this
dt <- data.table(ID=c("A","A","B","B"),Amount1=c(100,200,300,400),
Amount2=c(1500,1500,2400,2400),Dupl=c(1,0,1,0))
ID Amount1 Amount2 Dupl
1: A 100 1500 1
2: A 200 1500 0
3: B 300 2400 1
4: B 400 2400 0
我需要复制Dupl列中具有1的每一行,并在该重复的行中将Amount1值替换为Amount2值.除此之外,我需要在Dupl中为重复的行赋予值2.这意味着它应该像这样:
I need to duplicate each row that has a 1 in the Dupl column and replace the Amount1 value with the Amount2 value in that duplicated row. Besides that I need to give that duplicated row the value 2 in Dupl. This means it should look like this:
ID Amount1 Amount2 Dupl
1: A 100 1500 1
2: A 1500 1500 2
3: A 200 1500 0
4: B 300 2400 1
5: B 2400 2400 2
6: B 400 2400 0
非常感谢您的帮助! 亲切的问候,
Any help is much appreciated! Kind regards,
蒂姆
推荐答案
您可以尝试
rbind(dt,dt[Dupl==1][,c('Amount1', 'Dupl') := list(Amount2, 2)])
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