# Nodo SetDifference

**URL:** https://forum.dynamobim.com/t/nodo-setdifference/17800
**Category:** Lists-Logic
**Created:** [January 2, 2018, 11:16am UTC](https://forum.dynamobim.com/t/nodo-setdifference/17800 "2018-01-02T11:16:53Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![alex\_volt](https://avatars.discourse-cdn.com/v4/letter/a/ac8455/32.png) [@alex\_volt](https://forum.dynamobim.com/u/alex_volt)
#### Post date: [January 2, 2018, 3:36pm UTC](https://forum.dynamobim.com/t/nodo-setdifference/17800/4 "2018-01-02T15:36:45Z")

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I had already found this problem  
solved in

> [@Subtraction lists](https://forum.dynamobim.com/t/subtraction-lists/6278):
>
> List 1 with 12 points (red in the picture) List 2 with 5 points (green in the picture) subtraction —\> 7 points —\> List 3 It does not work the phrase (python image): if not (math.fabs (r-ind) == 0): r index List 1 ind index points to substract indexes results (points [1], [5], [10], [11])

I had forgotten the solution

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