将一组数据帧逐行合并为一个数据帧 [英] Combine a list of data frames into one data frame by row

问题描述

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

I got some pointers from an earlier question which was trying to do something similar but more complex.

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)

解决方案

Use bind_rows() from the dplyr package:

bind_rows(list_of_dataframes, .id = "column_label")

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