# Problem with subdomains

**URL:** <https://community.freefem.org/t/problem-with-subdomains/799>\
**Category:** General Discussion\
**Created:** [February 11, 2021, 11:31pm UTC](https://community.freefem.org/t/problem-with-subdomains/799 "2021-02-11T23:31:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![faya](https://avatars.discourse-cdn.com/v4/letter/f/a88e4f/32.png) [@faya](https://community.freefem.org/u/faya)\
**Post date:** [February 11, 2021, 11:31pm UTC](https://community.freefem.org/t/problem-with-subdomains/799/1 "2021-02-11T23:31:08Z")

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Hi everyone.  
Im novice in freefem and i need some help.  
I want to define a complicate domain.  
this domain is in the following picture.

 ![WhatsApp Image 2021-02-11 at 01.58.53 (1)](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/1X/f84afb4ee3f0f71c243cd77a67d1ce4be89ef6bd.jpeg)  
The code i choose is  
“”"int NbNoeuds = 120;  
real kAir=1;  
real kObjet=10;  
// Définition du carré

border b1(t=0,1){x=t;y=0;label=1;};  
border b2(t=0,1){x=1;y=t;label=1;};  
border b3(t=0,1){x=1-t;y=1;label=1;};  
border b4(t=0,1){x=0;y=1-t;label=1;};

“”"  
The coordonate of the small circles are (±0.75, ±0.75)

thank you

---

<div class="post-metadata">

**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\
**Post date:** [February 12, 2021, 12:59pm UTC](https://community.freefem.org/t/problem-with-subdomains/799/2 "2021-02-12T12:59:12Z")

</div>

A very close example

[Th-four.edp](https://community.freefem.org/uploads/short-url/e08YnEF7o0AGD0m9aFZgyQs3OmS.edp) (1.9 KB)

the graphic is:

 ![TH-four](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/1X/c950ced60b7ea72385ee610c09cc5f9cb6292d1f.jpeg)