R 列表到数据帧

Question

I have a nested list of data. Its length is 132 and each item is a list of length 20. Is there a quick way to convert this structure into a data frame that has 132 rows and 20 columns of data?

Here is some sample data to work with:

l <- replicate(
  132,
  list(sample(letters, 20)),
  simplify = FALSE
)

转载于:https://stackoverflow.com/questions/4227223/r-list-to-data-frame

Answer 1

Assuming your list of lists is called l:

df <- data.frame(matrix(unlist(l), nrow=132, byrow=T))

The above will convert all character columns to factors, to avoid this you can add a parameter to the data.frame() call:

df <- data.frame(matrix(unlist(l), nrow=132, byrow=T),stringsAsFactors=FALSE)