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
```

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
```

Any help is much appreciated! Kind regards,

Tim

Answer:

You could try

```
rbind(dt,dt[Dupl==1][,c('Amount1', 'Dupl') := list(Amount2, 2)])
```

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