How to expand a data frame rows by their index position in R?

To expand a data frame rows by its index position in R, we can follow the below steps −

• First of all, create a data frame.
• Then, use rep and seq_len function with nrow to expand the data frame rows by their index position.

Create the data frame

Let's create a data frame as shown below −

 Live Demo

x1<-rnorm(6) x2<-rnorm(6) df<-data.frame(x1,x2) df

On executing, the above script generates the below output(this output will vary on your system due to randomization) −

      x1          x2 1 -0.1738484 -0.5408279 2 0.5398176 0.1392769 3 0.2879338 -1.8792701 4 -1.4874235 0.6788907 5 0.9823864 0.9841566 6 -0.2491942 -1.8714372

Expand the data frame

Using rep and seq_len function with nrow to expand the rows in df by their index position −

 Live Demo

x1<-rnorm(6) x2<-rnorm(6) df<-data.frame(x1,x2) df<-df[rep(seq_len(nrow(df)),1:6),] df

Output

       x1             x2 1   -0.1738484    -0.5408279 2    0.5398176     0.1392769 2.   1 0.5398176   0.1392769 3    0.2879338    -1.8792701 3.   1 0.2879338  -1.8792701 3.   2 0.2879338  -1.8792701 4   -1.4874235     0.6788907 4.1 -1.4874235   0.6788907 4.2 -1.4874235     0.6788907 4.3 -1.4874235     0.6788907 5    0.9823864     0.9841566 5.1  0.9823864     0.9841566 5.2  0.9823864     0.9841566 5.3  0.9823864     0.9841566 5.4  0.9823864     0.9841566 6   -0.2491942    -1.8714372 6.1 -0.2491942    -1.8714372 6.2 -0.2491942    -1.8714372 6.3 -0.2491942    -1.8714372 6.4 -0.2491942    -1.8714372 6.5 -0.2491942    -1.8714372