# List Manipulation **URL:** \ **Category:** Lists-Logic\ **Created:** [March 12, 2018, 7:33pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940 "2018-03-12T19:33:52Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![PerfectArchCo](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/perfectarchco/32/28515_2.png) [@PerfectArchCo](https://forum.dynamobim.com/u/PerfectArchCo)\ **Post date:** [March 12, 2018, 7:33pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940/1 "2018-03-12T19:33:52Z")
I’m trying to do 2 different things which I assumed would be easy but am having difficulty configuring such a sequence in Dynamo. The input in a list of points from a divided surface and I am trying to1) develop a sequence to take them from the list of points and then 2) map that list to the list of points so that I end up with sub-lists which make up smaller polygons of the main surface to be manipulated further in the project. I imagine this is rather easy to do with straight python code (which I don’t have any deep knowledge of) of a particular configuration of nodes. Any feedback is appreciated. Thanks. ![Problem%20image2018-3](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/9/f/9f7ab20ca78752cbeb0c20ed1140c15211279fe5.png) ---
**Author:** ![Nick\_Boyts](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/nick_boyts/32/76313_2.png) [@Nick\_Boyts](https://forum.dynamobim.com/u/Nick_Boyts)\ **Post date:** [March 12, 2018, 8:33pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940/2 "2018-03-12T20:33:26Z")
I’m not sure I understand what you’re trying to do… You want to group certain points by their index to form sublists? Are your sequences supposed to overlap? ---
**Author:** ![PerfectArchCo](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/perfectarchco/32/28515_2.png) [@PerfectArchCo](https://forum.dynamobim.com/u/PerfectArchCo)\ **Post date:** [March 12, 2018, 9:50pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940/3 "2018-03-12T21:50:22Z")
Yes. That’s right. I want to map certain points by their index to sublists. They are suppose to overlap as the same point will represent several different polygons corners. ---
**Author:** ![Nick\_Boyts](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/nick_boyts/32/76313_2.png) [@Nick\_Boyts](https://forum.dynamobim.com/u/Nick_Boyts)\ **Post date:** [March 12, 2018, 10:04pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940/4 "2018-03-12T22:04:52Z")
Try GetItemAtIndex. You may have to change the lacing or use list levels. ---
**Author:** ![PerfectArchCo](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/perfectarchco/32/28515_2.png) [@PerfectArchCo](https://forum.dynamobim.com/u/PerfectArchCo)\ **Post date:** [March 12, 2018, 11:25pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940/5 "2018-03-12T23:25:02Z")
I’ve been using Get.Itematindex but am not sure how to feed it sublists nor make the original table of numbers. If feeding get.itematindex sub-lists, will it also output sublists. It’s interesting that I achieved to get the table of numbers and get the points in the order I wanted very quickly in Mathematica, I’m pretty sure the same operations can be configured purely in dynamo. ---
**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\ **Post date:** [March 12, 2018, 11:54pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940/6 "2018-03-12T23:54:35Z")
So you want to panelize the surface? Have you looked into the lunchbox and/or clockwork packages for this? ---
**Author:** ![PerfectArchCo](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/perfectarchco/32/28515_2.png) [@PerfectArchCo](https://forum.dynamobim.com/u/PerfectArchCo)\ **Post date:** [March 13, 2018, 1:42am UTC](https://forum.dynamobim.com/t/list-manipulation/19940/7 "2018-03-13T01:42:46Z")
I haven’t searched for “panelize” but I’m pretty sure the original points were from the lunchbox divide surface node. The outputted list needed to be further processed as far as I can tell, as it only gave the intersection points, not the points for each polygon of the divided surface. I’m away from Dynamo at the moment. ---
**Author:** ![PerfectArchCo](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/perfectarchco/32/28515_2.png) [@PerfectArchCo](https://forum.dynamobim.com/u/PerfectArchCo)\ **Post date:** [March 13, 2018, 7:46pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940/8 "2018-03-13T19:46:07Z")
Solved: Panel.PanelQuad from lunch box. Still have to do some further list manipulation but much quicker then generating the lists myself. ---
**Author:** ![Marcel\_Rijsmus](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/marcel_rijsmus/32/8539_2.png) [@Marcel\_Rijsmus](https://forum.dynamobim.com/u/Marcel_Rijsmus)\ **Post date:** [March 13, 2018, 8:11pm UTC](https://forum.dynamobim.com/t/list-manipulation/19940/9 "2018-03-13T20:11:47Z")
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