# Peference Points - List Management Question

**URL:** https://forum.dynamobim.com/t/peference-points-list-management-question/2316
**Category:** Packages
**Created:** [October 4, 2015, 12:18pm UTC](https://forum.dynamobim.com/t/peference-points-list-management-question/2316 "2015-10-04T12:18:30Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![Hany\_Iwamura](https://avatars.discourse-cdn.com/v4/letter/h/ed655f/32.png) [@Hany\_Iwamura](https://forum.dynamobim.com/u/Hany_Iwamura)
#### Post date: [October 4, 2015, 12:18pm UTC](https://forum.dynamobim.com/t/peference-points-list-management-question/2316/1 "2015-10-04T12:18:30Z")

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I think this is a simple question but I’m probably overthinking (classic me)

I have a grid of points in the x&y but I’m using a random tool for the Z. The result i’m getting is many points at each x&y coordinate. What I want is (x,y,random)

is this possible with my current dynamo setup.

![Random](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/2X/1/1e7907a602b948900d4de6bf06d78e7a70fbf2cf.jpg)

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thank you very much,

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### Author: ![Dimitar\_Venkov](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/dimitar_venkov/32/2068_2.png) [@Dimitar\_Venkov](https://forum.dynamobim.com/u/Dimitar_Venkov)
#### Post date: [October 4, 2015, 9:10pm UTC](https://forum.dynamobim.com/t/peference-points-list-management-question/2316/2 "2015-10-04T21:10:35Z")

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Hi,

I believe the easiest way is by making vectors first and then using them in a “Point.Add” node together with the points.

![2015-10-05_10-41-38](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/2X/e/e901094618ee896f9ef752b62f48ad846cf37c9e.png)

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### Author: ![Vikram\_Subbaiah](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/vikram_subbaiah/32/50797_2.png) [@Vikram\_Subbaiah](https://forum.dynamobim.com/u/Vikram_Subbaiah)
#### Post date: [October 4, 2015, 9:16pm UTC](https://forum.dynamobim.com/t/peference-points-list-management-question/2316/3 "2015-10-04T21:16:06Z")

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You need to ensure that the length of the three lists is the same.

In your case, I think, you need to change the value fed into the number port of your _Sequence.RandomNumbers_ node from 16 to 4

You also need to change the lacing on _ReferencePoint.By Coordinates_ to Shortest

![20151005-1](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/2X/8/86e2f203bfd3b53a9ec5ef141bbc083451947681.jpg)

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### Author: ![Hany\_Iwamura](https://avatars.discourse-cdn.com/v4/letter/h/ed655f/32.png) [@Hany\_Iwamura](https://forum.dynamobim.com/u/Hany_Iwamura)
#### Post date: [October 6, 2015, 6:26am UTC](https://forum.dynamobim.com/t/peference-points-list-management-question/2316/4 "2015-10-06T06:26:24Z")

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Thank you for your help. ‘Point.add’ is what I needed.