# How to Find the maximum eigenvalue of the matrix

**URL:** https://discourse.julialang.org/t/how-to-find-the-maximum-eigenvalue-of-the-matrix/71147
**Category:** General Usage
**Tags:** question, eigenvalues
**Created:** [November 8, 2021, 1:00pm UTC](https://discourse.julialang.org/t/how-to-find-the-maximum-eigenvalue-of-the-matrix/71147 "2021-11-08T13:00:02Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![F-YF](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/f-yf/32/17363_2.png) [@F-YF](https://discourse.julialang.org/u/F-YF)
#### Post date: [November 8, 2021, 1:00pm UTC](https://discourse.julialang.org/t/how-to-find-the-maximum-eigenvalue-of-the-matrix/71147/1 "2021-11-08T13:00:02Z")

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The eigen () function is going to compute all the eigen values of the matrix, and that takes a long time, so I just want the biggest eigen value ,so how to do that?

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### Author: ![rafael.guerra](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rafael.guerra/32/216610_2.png) [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)
#### Post date: [November 8, 2021, 1:06pm UTC](https://discourse.julialang.org/t/how-to-find-the-maximum-eigenvalue-of-the-matrix/71147/2 "2021-11-08T13:06:15Z")

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Check [this post](https://discourse.julialang.org/t/where-is-eigs-in-julia-1-0-version/24743/2) please ( `eigs` moved to [Arpack.jl](https://arpack.julialinearalgebra.org/stable/api/#Arpack.eigs-Tuple%7BAny%7D)).