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How to repeat a whole data.table object in R?
To repeat a whole data.table object in R, we can follow the below steps −
First of all, create a data.table object.
Then, use rep function to repeat the data.table object.
Example
Create the data.table object
Let’s create a data.table object as shown below −
library(data.table) x<-rpois(20,2) y<-rpois(20,5) z<-rpois(20,2) DT<-data.table(x,y,z) DT
Output
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
x y z 1: 3 3 4 2: 2 5 0 3: 2 6 1 4: 1 4 1 5: 3 6 1 6: 2 5 1 7: 1 1 3 8: 4 4 2 9: 2 3 1 10: 2 5 3 11: 2 4 2 12: 3 11 1 13: 0 3 2 14: 1 4 3 15: 4 4 1 16: 3 6 3 17: 1 3 2 18: 2 5 3 19: 1 1 1 20: 1 7 5
Repeat the data.table object
Using rep function to repeat the data.table object DT two times −
library(data.table) x<-rpois(20,2) y<-rpois(20,5) z<-rpois(20,2) DT<-data.table(x,y,z) DT[rep(1:nrow(DT),2),]
Output
x y z
1: 3 3 4
2: 2 5 0
3: 2 6 1
4: 1 4 1
5: 3 6 1
6: 2 5 1
7: 1 1 3
8: 4 4 2
9: 2 3 1
10: 2 5 3
11: 2 4 2
12: 3 11 1
13: 0 3 2
14: 1 4 3
15: 4 4 1
16: 3 6 3
17: 1 3 2
18: 2 5 3
19: 1 1 1
20: 1 7 5
21: 3 3 4
22: 2 5 0
23: 2 6 1
24: 1 4 1
25: 3 6 1
26: 2 5 1
27: 1 1 3
28: 4 4 2
29: 2 3 1
30: 2 5 3
31: 2 4 2
32: 3 11 1
33: 0 3 2
34: 1 4 3
35: 4 4 1
36: 3 6 3
37: 1 3 2
38: 2 5 3
39: 1 1 1
40: 1 7 5
x y z
Updated on: 08-Nov-2021
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