# How to delete a nonlinear constraint from a JuMP optimization problem

**URL:** <https://discourse.julialang.org/t/how-to-delete-a-nonlinear-constraint-from-a-jump-optimization-problem/53469>\
**Category:** Optimization (Mathematical)\
**Tags:** jump\
**Created:** [January 17, 2021, 3:22am UTC](https://discourse.julialang.org/t/how-to-delete-a-nonlinear-constraint-from-a-jump-optimization-problem/53469 "2021-01-17T03:22:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![boranzhao](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/boranzhao/32/20802_2.png) [@boranzhao](https://discourse.julialang.org/u/boranzhao)\
**Post date:** [January 17, 2021, 3:22am UTC](https://discourse.julialang.org/t/how-to-delete-a-nonlinear-constraint-from-a-jump-optimization-problem/53469/1 "2021-01-17T03:22:05Z")

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Hello,

I know that `delete` can be used to delete constraints and variables from a JuMP problem. However, based on my testing, it does not work for **nonlinear** constraint added through `@NLconstraint`. I was wondering whether it is possible to delete the nonlinear constraint.

Best  
Pan

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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:** [January 18, 2021, 3:39am UTC](https://discourse.julialang.org/t/how-to-delete-a-nonlinear-constraint-from-a-jump-optimization-problem/53469/2 "2021-01-18T03:39:03Z")

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It is not possible to delete a nonlinear constraint: [https://github.com/jump-dev/JuMP.jl/issues/2355](https://github.com/jump-dev/JuMP.jl/issues/2355)

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**Author:** ![boranzhao](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/boranzhao/32/20802_2.png) [@boranzhao](https://discourse.julialang.org/u/boranzhao)\
**Post date:** [January 18, 2021, 4:22am UTC](https://discourse.julialang.org/t/how-to-delete-a-nonlinear-constraint-from-a-jump-optimization-problem/53469/3 "2021-01-18T04:22:49Z")

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@odow I see. Thank you for the information.