I have two pairs of time intervals: coarse- and fine-grained. They're
components of their respective dataframes, looking like,
coarse: endtime starttime
1 t1_end t1_start
2 t2_end t2_start
...
fine: is the same, except that its intervals presumably fall into the
coarse's enclosing ones.
The problem is to partition the fine intervals into the coarse ones,
adding a list to each row showing which fine intervals fall in it, like
coarse: ... fine
1 [1,2]
2 [3,4,5]
Is there a functional way to do this?
Cheers,
Alexy
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