Question

I have a named list that looks like this:

> head(pathways)
$<NA>
NULL
$`2`
[1] "hsa04610"
$`9`
[1] "hsa00232" "hsa00983" "hsa01100"
$`10`
[1] "hsa00232" "hsa00983" "hsa01100"
$<NA>
NULL
$<NA>
NULL

To describe it more formerly. The name of each list is an id number, and the entries of each element of the character vector that are elements of the list is another id number. I can filter out the $<NA> entries easily with is.na(), but then I want to change the rest so it would look like:

id   another_id
2    hsa04610   
9    hsa00232   
9    hsa00983   
9    hsa01100   
10   hsa00232  
10   hsa00983
10   hsa01100


> dput(test)
structure(list(`NA` = NULL, `2` = "hsa04610", `9` = c("hsa00232", 
"hsa00983", "hsa01100"), `10` = c("hsa00232", "hsa00983", "hsa01100"
), `NA` = NULL, `NA` = NULL), .Names = c(NA, "2", "9", "10", 
NA, NA))

Any ideas?

Answer 1

So I found another answer that seems to work.

stack(pathways)

This seems too easy, but oh well.