How to combine a list of data frames into one data frame

Question

I have code that in one place ends up with a list of data frames which I really want to convert to a single big data frame.

Here's an example of what I am starting with (this is grossly simplified for illustration):

listOfDataFrames <- vector(mode = "list", length = 100)

for (i in 1:100) {
    listOfDataFrames[[i]] <- data.frame(a=sample(letters, 500, rep=T),
                             b=rnorm(500), c=rnorm(500))
}

I am currently using this:

  df <- do.call("rbind", listOfDataFrames)

Answer 1

Use bind_rows() from the dplyr package:

bind_rows(list_of_dataframes, .id = "column_label")