# How to compare the same function on different meshes

**URL:** https://community.freefem.org/t/how-to-compare-the-same-function-on-different-meshes/904
**Category:** General Discussion
**Created:** [April 11, 2021, 3:35am UTC](https://community.freefem.org/t/how-to-compare-the-same-function-on-different-meshes/904 "2021-04-11T03:35:16Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![dajopez](https://avatars.discourse-cdn.com/v4/letter/d/a87d85/32.png) [@dajopez](https://community.freefem.org/u/dajopez)
#### Post date: [April 11, 2021, 3:35am UTC](https://community.freefem.org/t/how-to-compare-the-same-function-on-different-meshes/904/1 "2021-04-11T03:35:16Z")

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Hello,

To test accuracy, I would like to solve the same differential equation on different meshes and then compute the difference as integrals. Can I just naively subtract the two functions or do I need to do additional work to make the meshes line up?

Thank you for the help.