Combine (rbind) data frames and create column with name of original data frames

Question

I have several data frames that I want to combine by row. In the resulting single data frame, I want to create a new variable identifying which data set the observation came

Answer 1

Another approach using dplyr:

df1 <- data.frame(x = c(1,3), y = c(2,4))
df2 <- data.frame(x = c(5,7), y = c(6,8))

df3 <- dplyr::bind_rows(list(df1=df1, df2=df2), .id = 'source')

df3
Source: local data frame [4 x 3]

  source     x     y
   (chr) (dbl) (dbl)
1    df1     1     2
2    df1     3     4
3    df2     5     6
4    df2     7     8