First item of first sublist, second item of second sublist

1

Hi all,

First time posting here but reading other posts on these forums has been an invaluable resource as I’ve been learning Dynamo so many thanks for that.

So I have a problem which sounds simple but I can’t work out. What it comes to is that I have a list which has N sublists, all of which have N sublists of their own. There are further levels of nesting beyond this, but I don’t think that’s relevant right now. What I want is to return the first element of the first sublist, the second element of the second sublist, the third of the third sublist and so on. Basically for a list ‘X’ I would want a new list ‘Y’ where Y[n] = X [n][n] for all n between 0 and N-1 i.e Y = {X[0][0],X[1][1],X[2][2]…}. Is this something anyone has encountered before?

Many Thanks

2

Like this?
NthOfNth

5 Likes
3

Exactly like that!

I eventually worked out my own solution by basically flattening the list and having a section of the graph working out the indices I wanted to retrieve. Yours is a much simpler solution although I have to admit I don’t entirely understand it, I haven’t used the ‘use levels’ checkbox before. Is there a tutorial anywhere you’re aware of which explains how exactly this works?

Many thanks again for your solution!

4

Start here:
http://dynamobim.org/introducing-listlevel-working-with-lists-made-easier/

2 Likes
5

Many thanks Andreas