# How to construct a FE function from values at the nodes

**URL:** <https://community.freefem.org/t/how-to-construct-a-fe-function-from-values-at-the-nodes/3175>\
**Category:** General Discussion\
**Created:** [April 29, 2024, 12:27pm UTC](https://community.freefem.org/t/how-to-construct-a-fe-function-from-values-at-the-nodes/3175 "2024-04-29T12:27:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![PeterQ](https://avatars.discourse-cdn.com/v4/letter/p/df788c/32.png) [@PeterQ](https://community.freefem.org/u/PeterQ)\
**Post date:** [April 29, 2024, 12:27pm UTC](https://community.freefem.org/t/how-to-construct-a-fe-function-from-values-at-the-nodes/3175/1 "2024-04-29T12:27:57Z")

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Dear Freefem community, I have encountered some difficulties. I first established a space and divided it into tetrahedral finite elements, then I used other software to calculate the values of a function at the vertices of these tetrahedra. Now I want to reconstruct this function in this finite element space, please tell me how I should do it.