# Assembling of RHS for nonlinear Helmholtz eq. (Thermoacoustics)

**URL:** <https://fenicsproject.discourse.group/t/assembling-of-rhs-for-nonlinear-helmholtz-eq-thermoacoustics/7824>\
**Category:** Linear Algebra\
**Created:** [March 10, 2022, 10:11am UTC](https://fenicsproject.discourse.group/t/assembling-of-rhs-for-nonlinear-helmholtz-eq-thermoacoustics/7824 "2022-03-10T10:11:00Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\
**Post date:** [March 17, 2022, 10:18am UTC](https://fenicsproject.discourse.group/t/assembling-of-rhs-for-nonlinear-helmholtz-eq-thermoacoustics/7824/5 "2022-03-17T10:18:19Z")

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Assemble is an integration command.  
If you want to evaluate a trial function at a given point, see for instance:  
[https://bitbucket.org/fenics-project/dolfin/src/43642bad27866a5bf4e8a117c87c0f6ba777b196/python/test/unit/fem/test\_manifolds.py?at=master#test\_manifolds.py-235,243](https://bitbucket.org/fenics-project/dolfin/src/43642bad27866a5bf4e8a117c87c0f6ba777b196/python/test/unit/fem/test_manifolds.py?at=master#test_manifolds.py-235,243)  
or  
[Evaluate\_basis() gives strange results - #2 by kamensky](https://fenicsproject.discourse.group/t/evaluate-basis-gives-strange-results/2153/2) (and the original post in the linked thread)

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