unlist.data.table S3 generic
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 45/100
Research direction
Locate the unlist.data.table S3 entry point and reproduce the R example with the supplied data.table. Define the single-column behavior so unlist(DT, col="y") produces the shown rows; the handling of multiple columns remains an open design question.
Written by the indexing model from the issue text.
Description
require(data.table)
DT = data.table(x = 1:3, y=list(1:2, 3:4, 5:7))
# x y
#1: 1 1,2
#2: 2 3,4
#3: 3 5,6,7
unlist(DT, col="y")
# x y
#1: 1 1
#2: 1 2
#3: 2 3
#4: 2 4
#5: 3 5
#6: 3 6
#7: 3 7
col should accept only one value at the moment. Not sure if/how to handle multiple columns yet.
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