# Cumputing the eigenvalues of the 2d wave equation

**URL:** https://community.freefem.org/t/cumputing-the-eigenvalues-of-the-2d-wave-equation/710
**Category:** General Discussion
**Created:** [December 27, 2020, 11:58am UTC](https://community.freefem.org/t/cumputing-the-eigenvalues-of-the-2d-wave-equation/710 "2020-12-27T11:58:51Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![mordechaiy](https://avatars.discourse-cdn.com/v4/letter/m/cc9497/32.png) [@mordechaiy](https://community.freefem.org/u/mordechaiy)
#### Post date: [December 27, 2020, 11:58am UTC](https://community.freefem.org/t/cumputing-the-eigenvalues-of-the-2d-wave-equation/710/1 "2020-12-27T11:58:51Z")

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Dear FF++ user,

I would like to ask please, how can I solve the generalized eigen values for computing the eigenvalues of the 2D wave equation in a square,  
using PETSc and SLEPc?

Thanks in advance,  
Mordechai.

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### Author: ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)
#### Post date: [December 27, 2020, 1:24pm UTC](https://community.freefem.org/t/cumputing-the-eigenvalues-of-the-2d-wave-equation/710/2 "2020-12-27T13:24:43Z")

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You can have a look at one of the many [examples](https://github.com/FreeFem/FreeFem-sources/blob/develop/examples/hpddm/README.md#eigenvalue-problems).