# Extreme ray values unbounded LP JuMP

**URL:** https://discourse.julialang.org/t/extreme-ray-values-unbounded-lp-jump/102686
**Category:** Optimization (Mathematical)
**Tags:** question, jump, dual
**Created:** [August 10, 2023, 5:02pm UTC](https://discourse.julialang.org/t/extreme-ray-values-unbounded-lp-jump/102686 "2023-08-10T17:02:56Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [August 10, 2023, 8:37pm UTC](https://discourse.julialang.org/t/extreme-ray-values-unbounded-lp-jump/102686/4 "2023-08-10T20:37:27Z")

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Do you have a reproducible example?

If `dual_status(model)` is `INFEASIBILITY_CERTIFICATE`, then the `dual(constraint)` is the associated dual ray.

In some cases, even if the problem is unbounded, the solver might not return a dual ray. In this case, the dual status is `NO_SOLUTION`. You might need to set some solver options, like disabling presolve, in order to force the solver to compute a certificate.

See also [Stuck with infeasibility certificates in JuMP.jl](https://discourse.julialang.org/t/stuck-with-infeasibility-certificates-in-jump-jl/102210)

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