# Bug detected in Arpack

**URL:** <https://discourse.julialang.org/t/bug-detected-in-arpack/55334>\
**Category:** General Usage\
**Created:** [February 15, 2021, 4:32pm UTC](https://discourse.julialang.org/t/bug-detected-in-arpack/55334 "2021-02-15T16:32:31Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [February 16, 2021, 9:52am UTC](https://discourse.julialang.org/t/bug-detected-in-arpack/55334/4 "2021-02-16T09:52:59Z")

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> [@iamsuddhasattwa](#):
>
> A language meant to do high performance computing should be able to find 4 eigenvalues of a 16X16 symmetric matrix.

I am wondering if you are aware of

```julia
using LinearAlgebra
(vals, vecs) = eigen(Symmetric(K))

```

> [@iamsuddhasattwa](#):
>
> I could do it myself on pen and paper.

That’s very clever of you! Note, however, that this a _bug_ in a _package_ that is not part of the language _per se_. Bugs happen, and that does not reflect on what Julia is or isn’t able to do. Also, while I am as much of a fan as drama as the next person, it is unlikely to lead to the timelier resolution of bugs.

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