Extract vectors from list to dataframe columns

Question

I have a list that contains vectors of strings like this:

A <- list(c("A", "1"), c("G", "2"), c("T", "6"), c("A", "1"), c("A", "1"), 
          c("A", "1"), c("A", "1"), c("A", "2"), c("A", "2"), c("A", "2"), 
          c("A", "2"), c("A", "3"), c("X", "3"), c("A", "4"), c("A", "4"), 
          c("A", "4"), c("A", "5"), c("A", "5"), c("A", "2"), c("A", "6"))

I want to creat two columns in a dataframe, one with the first elements ("A", "G", ...) and one with the second element (1, 2, ...).

The example list you provided is not nested – Sotos Oct 27 '17 at 09:21 — Sotos, Oct 27 '17 at 09:21

score 1 · Accepted Answer · answered Oct 27 '17 at 09:20

1

We rbind the list elements with do.call and then convert the matrix to data.frame

as.data.frame(do.call(rbind, A))

answered Oct 27 '17 at 09:20

akrun

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score 1 · Answer 2 · answered Oct 27 '17 at 09:29

1

You can also unlist A.

as.data.frame(matrix(unlist(A), ncol = 2, byrow = TRUE))

answered Oct 27 '17 at 09:29

nghauran

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Extract vectors from list to dataframe columns

2 Answers2