# Does Optim not support function optimization with matrix variables?

**URL:** https://discourse.julialang.org/t/does-optim-not-support-function-optimization-with-matrix-variables/47475
**Category:** General Usage
**Tags:** question, optim, optimization
**Created:** [September 29, 2020, 8:25am UTC](https://discourse.julialang.org/t/does-optim-not-support-function-optimization-with-matrix-variables/47475 "2020-09-29T08:25:06Z")
**Posts on this page:** 1
**Showing post:** 15

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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: [October 10, 2020, 11:49am UTC](https://discourse.julialang.org/t/does-optim-not-support-function-optimization-with-matrix-variables/47475/15 "2020-10-10T11:49:16Z")

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> [@antoine-levitt](#):
>
> I’m pretty sure Optim supports general AbstractArrays.

Can you read this discussion? I don’t know if Optim doesn’t support general AbstractArrays very well, or if my function itself defines the problem.  
[https://discourse.julialang.org/t/no-method-matching-isless-array-float64-2-array-float64-2/48086](https://discourse.julialang.org/t/no-method-matching-isless-array-float64-2-array-float64-2/48086)

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