# ANN: DispersionRelations.jl

**URL:** <https://discourse.julialang.org/t/ann-dispersionrelations-jl/104815>\
**Category:** Package Announcements\
**Tags:** physics\
**Created:** [October 10, 2023, 7:26pm UTC](https://discourse.julialang.org/t/ann-dispersionrelations-jl/104815 "2023-10-10T19:26:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jack\_Coughlin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jack_coughlin/32/28571_2.png) [@Jack\_Coughlin](https://discourse.julialang.org/u/Jack_Coughlin)\
**Post date:** [October 10, 2023, 7:26pm UTC](https://discourse.julialang.org/t/ann-dispersionrelations-jl/104815/1 "2023-10-10T19:26:58Z")

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[DispersionRelations.jl](https://github.com/johnbcoughlin/DispersionRelations.jl)

This is my first package, a small utility for estimating complex frequencies of exponentially growing or damping phenomena.

To illustrate, this package provides a function to estimate the slopes of the dashed lines:

 ![electric_energy](https://global.discourse-cdn.com/julialang/original/3X/f/a/fa9629a00557d1e9813efec3ca586624b2cb1c2a.png)

Computational physicists may find this useful for estimating dispersion relations of instabilities in the linear phase.

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**Author:** ![pnavaro](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pnavaro/32/5008_2.png) [@pnavaro](https://discourse.julialang.org/u/pnavaro)\
**Post date:** [November 28, 2023, 5:56pm UTC](https://discourse.julialang.org/t/ann-dispersionrelations-jl/104815/2 "2023-11-28T17:56:35Z")

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Nice 👍 could you register it ? It is very useful to test my Vlasov solvers 😉

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<div class="post-metadata">

**Author:** ![Jack\_Coughlin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jack_coughlin/32/28571_2.png) [@Jack\_Coughlin](https://discourse.julialang.org/u/Jack_Coughlin)\
**Post date:** [November 28, 2023, 6:32pm UTC](https://discourse.julialang.org/t/ann-dispersionrelations-jl/104815/3 "2023-11-28T18:32:16Z")

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Thanks for the encouragement! It’s registered but there’s a three day waiting period. In the meantime you can always add it by URL, I think something like

```julia
pkg> add https://github.com/johnbcoughlin/DispersionRelations.jl

```

should work.