# Rate of change in temperature at everypoint on a heated circle

**URL:** <https://community.freefem.org/t/rate-of-change-in-temperature-at-everypoint-on-a-heated-circle/2708>\
**Category:** General Discussion\
**Created:** [September 15, 2023, 1:53am UTC](https://community.freefem.org/t/rate-of-change-in-temperature-at-everypoint-on-a-heated-circle/2708 "2023-09-15T01:53:52Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![cmd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/cmd/32/67_2.png) [@cmd](https://community.freefem.org/u/cmd)\
**Post date:** [September 16, 2023, 11:46am UTC](https://community.freefem.org/t/rate-of-change-in-temperature-at-everypoint-on-a-heated-circle/2708/7 "2023-09-16T11:46:00Z")

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You can compute it yourself using the known geometry of your mesh. Or you can do something like:

```auto
varf vHF(p,q) = on(BoundaryLabel, p = N.x*dx(T) + N.y*dy(T));
Vh HF;
HF[] = vHF(0,Vh,tgv=1);

```

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