# Complex root finder for a general function f(z)?

**URL:** https://discourse.julialang.org/t/complex-root-finder-for-a-general-function-f-z/35989
**Category:** New to Julia
**Tags:** question, package, roots
**Created:** [March 14, 2020, 9:12pm UTC](https://discourse.julialang.org/t/complex-root-finder-for-a-general-function-f-z/35989 "2020-03-14T21:12:26Z")
**Posts on this page:** 1
**Showing post:** 8

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### Author: ![sgjanssens](https://avatars.discourse-cdn.com/v4/letter/s/9f8e36/32.png) [@sgjanssens](https://discourse.julialang.org/u/sgjanssens)
#### Post date: [March 19, 2020, 9:43am UTC](https://discourse.julialang.org/t/complex-root-finder-for-a-general-function-f-z/35989/8 "2020-03-19T09:43:07Z")

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Although you mention a “general complex equation in a certain complex region”, I would still be interested if you are motivated by a certain subclass with more structure to it.

For example, it often happens that such problems originate as nonlinear eigenvalue problems and it is desired to find all roots in a vertical strip, maybe for (in)stability considerations of some underlying dynamical system. In that case, [NEP-PACK](https://nep-pack.github.io/NonlinearEigenproblems.jl/), also discussed [here](https://discourse.julialang.org/t/nep-pack-1-0-a-julia-package-for-nonlinear-eigenvalue-problems/), may be interesting.

(I cannot help you with its use, but @jarl or his co-authors mentioned in that thread may be able to.)

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