# Warning for adding constraints: zero or small (\< 1e-13) coefficients, ignored

**URL:** <https://discourse.julialang.org/t/warning-for-adding-constraints-zero-or-small-1e-13-coefficients-ignored/34137>\
**Category:** Optimization (Mathematical)\
**Created:** [February 3, 2020, 10:33pm UTC](https://discourse.julialang.org/t/warning-for-adding-constraints-zero-or-small-1e-13-coefficients-ignored/34137 "2020-02-03T22:33:23Z")\
**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:** [February 4, 2020, 2:29pm UTC](https://discourse.julialang.org/t/warning-for-adding-constraints-zero-or-small-1e-13-coefficients-ignored/34137/4 "2020-02-04T14:29:07Z")

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Take a read of the first post of [Please read: make it easier to help you](https://discourse.julialang.org/t/psa-make-it-easier-to-help-you/14757). (Don’t worry about the rest of the thread.)

It’s a lot easier to help if you provide a minimal example of what you tried and what went wrong.

Did `set_parameter(model, "NonConvex", 2)` take a long time, or the solve itself? Note that non convex quadratics are difficult to solve, and depending on the problem size, it’s not uncommon for it to take a long time.

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_[View the full topic](https://discourse.julialang.org/t/warning-for-adding-constraints-zero-or-small-1e-13-coefficients-ignored/34137)._