# JuMP 0.18: how to delete constraints (without reference)?

**URL:** <https://discourse.julialang.org/t/jump-0-18-how-to-delete-constraints-without-reference/37175>\
**Category:** Optimization (Mathematical)\
**Created:** [April 7, 2020, 2:33pm UTC](https://discourse.julialang.org/t/jump-0-18-how-to-delete-constraints-without-reference/37175 "2020-04-07T14:33:14Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![mike\_k](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mike_k/32/211864_2.png) [@mike\_k](https://discourse.julialang.org/u/mike_k)\
**Post date:** [April 7, 2020, 2:56pm UTC](https://discourse.julialang.org/t/jump-0-18-how-to-delete-constraints-without-reference/37175/3 "2020-04-07T14:56:11Z")

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Well, I wanted to do that but I still observe for some reason that it is much slower as reported [here](https://discourse.julialang.org/t/jump-0-21-1-cplex-error-1811-attempt-to-invoke-unsupported-operation/36605/3) ☹

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