# 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:** 9

<div class="post-metadata">

**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, 5:32pm UTC](https://discourse.julialang.org/t/warning-for-adding-constraints-zero-or-small-1e-13-coefficients-ignored/34137/9 "2020-02-04T17:32:31Z")

</div>

You’re halfway there with the example, but we need a little more information. In particular, we don’t know what inputs you used for the function. ([Number 3 in the PSA](https://discourse.julialang.org/t/psa-make-it-easier-to-help-you/14757).)

To make it simpler (Number 4), try using a small value of `I`, `J`, and `W` (e.g., 1). Does it run? If so, you’re just solving a hard problem. If it still doesn’t run, comment out all of the constraints, and then add them in one-by-one.

The lack of printing is probably because you’re using IJulia. For some reason, it doesn’t flush the Gurobi log to the screen while it’s running.

---

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