I have a list of data frames, structured like this.

I need to extract a variable number of elements from said list, and will just be joining them together using an identifier after I'm finished.

Extraction using the [[]] method works, but I cannot seem to get it to take a range.

This works:

x <- pf_metrics[[[1]]]

It extracts the entire first dataframe, in the original structure. This is what I would like to do, but across a variable length of dataframe lists.

Using syntax like...

x <- pf_metrics[c[1:length(pf_metrics)]]

OR

x <- pf_metrics[[c(1,2)]]

Doesn't seem to work either.

Thanks!

CodePudding user response：

Try the following -

num <- c(1, 2)
result <- dplyr::bind_rows(pf_metrics[num], .id = 'id')

where num are the list elements that you want to select and it will also include an id column which would be unique identifier of each list.

CodePudding user response：

Using data.table

library(data.table)
num <- c(1, 2)
result <- rbindlist(pf_metrics[num], idcol = 'id')