Hello, I have a list and wanna do Math.sum within sublists of list. I tried with @list but still not working. As in picture attached, I want sum of numbers under marked 0 List, 1 List and so on. I dont know how should i remove the extra lists under these main lists i.e these four lists under marked…

[image] shershahbacha9: I dont wanna change the list structure as i need it in the end. The input nodes are blue in my example because I’ve checked Keep List Structure Doing the same on the Math.Sum node might get you the intended result. You’ll need to handle the nulls though [sum1]

Math.sum on list

DesignScript

jacob.small August 4, 2020, 7:20am 2

Try List.Flatten but @L3 (or 2 - I get this one wrong often enough).

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Math.sum on list

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