# Addressing edges of a boundary

**URL:** <https://community.freefem.org/t/addressing-edges-of-a-boundary/1714>\
**Category:** General Discussion\
**Created:** [May 3, 2022, 10:16pm UTC](https://community.freefem.org/t/addressing-edges-of-a-boundary/1714 "2022-05-03T22:16:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mahdi](https://avatars.discourse-cdn.com/v4/letter/m/e9c0ed/32.png) [@mahdi](https://community.freefem.org/u/mahdi)\
**Post date:** [May 3, 2022, 10:16pm UTC](https://community.freefem.org/t/addressing-edges-of-a-boundary/1714/1 "2022-05-03T22:16:10Z")

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Hi

I want to address the edges of an internal border (for instance, label=1). Does the label on a border refer to the elements or edges?

To explain better, “NtonEdge” is a boolean that discusses the edges and **can be used inside intalledges** …  
How can I apply intalledges for a specific inner boundary?

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<div class="post-metadata">

**Author:** ![mahdi](https://avatars.discourse-cdn.com/v4/letter/m/e9c0ed/32.png) [@mahdi](https://community.freefem.org/u/mahdi)\
**Post date:** [May 5, 2022, 2:47am UTC](https://community.freefem.org/t/addressing-edges-of-a-boundary/1714/2 "2022-05-05T02:47:43Z")

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I think BoundaryEdge should help us, and writing like

intalledges(  
(BoundaryEdge)._(1-NtonEdge)._…  
);