# SDP relaxation in PowerModelsAneex

**URL:** <https://discourse.julialang.org/t/sdp-relaxation-in-powermodelsaneex/41898>\
**Category:** Optimization (Mathematical)\
**Created:** [June 22, 2020, 11:26pm UTC](https://discourse.julialang.org/t/sdp-relaxation-in-powermodelsaneex/41898 "2020-06-22T23:26:49Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![Rasoul](https://avatars.discourse-cdn.com/v4/letter/r/bb73d2/32.png) [@Rasoul](https://discourse.julialang.org/u/Rasoul)\
**Post date:** [July 17, 2020, 4:13pm UTC](https://discourse.julialang.org/t/sdp-relaxation-in-powermodelsaneex/41898/6 "2020-07-17T16:13:51Z")

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Hi Dr Coffrin,

Thanks for the response. I is the eye matrix, defined in LinearAlgebra package, that you have directly used in your SDP code in PowerModels. You have used LinearAlgebra package in your code. But When I added that package to PowerModelsAnnex I got the above error. My problem is how I can use the LinearAlgebra library in the power model annex. I will definitely look at the Julia package development documents.

All the best,  
Rasoul

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