# \#quadratic

**URL:** https://discourse.julialang.org/tag/quadratic/1332.md

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## [Slow JuMP model creation](https://discourse.julialang.org/t/slow-jump-model-creation/122005)

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**Author:** [@jakubp](https://discourse.julialang.org/u/jakubp)\
**Replies:** 3\
**Last updated:** [October 31, 2024, 5:52pm UTC](https://discourse.julialang.org/t/slow-jump-model-creation/122005 "2024-10-31T17:52:30Z")

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I am trying to solve a very large (N=100M variables) and very sparse (density ~ 1/N) QUBO problem, using CPLEX interfaced via JuMP. To this end, I’m using the following function function solve\_with\_CPLEX(Q) L = size(…

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## [Recommendations for solver and options to solve a MIQP, just looking for a feasible solution](https://discourse.julialang.org/t/recommendations-for-solver-and-options-to-solve-a-miqp-just-looking-for-a-feasible-solution/107024)

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**Author:** [@nsajko](https://discourse.julialang.org/u/nsajko)\
**Replies:** 5\
**Last updated:** [August 22, 2024, 10:03am UTC](https://discourse.julialang.org/t/recommendations-for-solver-and-options-to-solve-a-miqp-just-looking-for-a-feasible-solution/107024 "2024-08-22T10:03:24Z")

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I formulated a mixed-integer quadratic program (MIQP) using MathOptInterface.jl to solve a problem for a student competition. It’s got some continuous variables that are the solution I’m looking for, and I also had to in…

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## [Julia never stops compiling for new recursive Vector types](https://discourse.julialang.org/t/julia-never-stops-compiling-for-new-recursive-vector-types/110232)

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**Author:** [@mnemnion](https://discourse.julialang.org/u/mnemnion)\
**Replies:** 18\
**Last updated:** [February 15, 2024, 8:21pm UTC](https://discourse.julialang.org/t/julia-never-stops-compiling-for-new-recursive-vector-types/110232 "2024-02-15T20:21:54Z")

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This is… unexpected behavior. I feel like inference should give up at some point. julia\> w = \[1\]; @time for i = 1:100 global w = \[w\] end 0.227547 seconds (466.23 k allocations: 31.348 MiB, 1.52% gc tim…

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## [Pi (Π) operation in the objective function JuMP](https://discourse.julialang.org/t/pi-operation-in-the-objective-function-jump/97509)

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**Author:** [@Shayan](https://discourse.julialang.org/u/Shayan)\
**Replies:** 19\
**Last updated:** [May 8, 2023, 11:55pm UTC](https://discourse.julialang.org/t/pi-operation-in-the-objective-function-jump/97509 "2023-05-08T23:55:42Z")

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I want to solve a quadratic programming problem with JuMP. I don’t know if Ipopt can solve it or not. I’m using HiGHS (Although I prefer Ipopt if it’s possible). Here is the model: \\eqalign{ & \\max z = \\prod\\limits\_{…