Let me try to explain it again.
Please see the image of the lengths in the first list now the list is flattened, to hopefully help me get across what I’m trying to do.
The numbers (curve lengths) in the first list. I’m trying to compare to all the numbers in the second list (data trees) to give me two matching ‘true’ results in the final list.
The reason it wasn’t flattened in the first example is because it just gives 10 false results per data tree. If it was unflattened it does at least give me one true result which I do understand is only searching one data tree per one date tree. The bit I can’t work out is how to search all the data trees with the first list.