# Operator error of exp function

**URL:** https://community.freefem.org/t/operator-error-of-exp-function/3564
**Category:** General Discussion
**Created:** [October 27, 2024, 9:03am UTC](https://community.freefem.org/t/operator-error-of-exp-function/3564 "2024-10-27T09:03:49Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Zucker](https://avatars.discourse-cdn.com/v4/letter/z/5e9695/32.png) [@Zucker](https://community.freefem.org/u/Zucker)
#### Post date: [October 27, 2024, 9:03am UTC](https://community.freefem.org/t/operator-error-of-exp-function/3564/1 "2024-10-27T09:03:49Z")

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hello I’m trying to write weak formulation for PDE system and I can’t use the function exp for the result u(x,y) and I get the error operator error . I will be glad to get some help.