# Adaptive DG FF++ code poisson eqn

**URL:** <https://community.freefem.org/t/adaptive-dg-ff-code-poisson-eqn/3825>\
**Category:** General Discussion\
**Created:** [March 28, 2025, 11:18pm UTC](https://community.freefem.org/t/adaptive-dg-ff-code-poisson-eqn/3825 "2025-03-28T23:18:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Monirul25](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/monirul25/32/3287_2.png) [@Monirul25](https://community.freefem.org/u/Monirul25)\
**Post date:** [March 28, 2025, 11:18pm UTC](https://community.freefem.org/t/adaptive-dg-ff-code-poisson-eqn/3825/1 "2025-03-28T23:18:13Z")

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Dear all experts and respected professor, i have tried to write the code of Example 1 and i am trying to verifying the results which are given in the following paper.  
[Numerical Methods Partial - 2019 - Cui - A posteriori error estimate for discontinuous Galerkin finite element method on.pdf](https://community.freefem.org/uploads/short-url/5FNZWOdzewHmkju8mFj3U4ndUZN.pdf) (1.7 MB)

I have done the FF++ code accordingly in the above paper. But good results is not coming.  
Here, is my code\>  
[Poisson\_adapt\_DG.edp](https://community.freefem.org/uploads/short-url/sC1l5RW8L3hriUIDPiesFLzqOvK.edp) (5.8 KB)

Thanks in advance!.