# Comparing 2 lists and "extracting the true" values

**URL:** <https://forum.dynamobim.com/t/comparing-2-lists-and-extracting-the-true-values/6140>\
**Category:** Uncategorized\
**Created:** [September 12, 2016, 2:22pm UTC](https://forum.dynamobim.com/t/comparing-2-lists-and-extracting-the-true-values/6140 "2016-09-12T14:22:53Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Tomasz\_Puchala](https://avatars.discourse-cdn.com/v4/letter/t/5f9b8f/32.png) [@Tomasz\_Puchala](https://forum.dynamobim.com/u/Tomasz_Puchala)\
**Post date:** [September 12, 2016, 2:48pm UTC](https://forum.dynamobim.com/t/comparing-2-lists-and-extracting-the-true-values/6140/2 "2016-09-12T14:48:20Z")

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I think this thread might help you.

> [@How to Control Revit Family via an Excel File?](https://forum.dynamobim.com/t/how-to-control-revit-family-via-an-excel-file/5752/3):
>
> Thanks Tomasz, for your reply. But for some reason when I connect the output from the List.GetItem.AtIndex to either Point.ByCoordinates or FamilyInstance.ByCoordinates it doesn’t generate a point list, unlike your illustration. Essentially what I would like to do is extract the values from the attached Excel spreadsheet to either create new or move existing families in the Revit file. The Cube shape is immaterial, it could be any family, I have used a cube with parametric values a,b,c for th…

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