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#orms

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Solver Max<p>Pivot irrigators in a 100 acre field</p><p>We formulate a non-linear, non-convex model for optimizing the layout of centre-pivot irrigators in a field. Several free and commercial solvers fail to find good solutions. Then we try the MINLP-BB solver via NEOS using a multi-start technique.<br />Can it find an optimal solution?<br /><a href="https://mathstodon.xyz/tags/python" class="mention hashtag" rel="tag">#<span>python</span></a> <a href="https://mathstodon.xyz/tags/orms" class="mention hashtag" rel="tag">#<span>orms</span></a> <br /><a href="https://www.solvermax.com/blog/pivot-irrigators-in-a-100-acre-field" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">solvermax.com/blog/pivot-irrig</span><span class="invisible">ators-in-a-100-acre-field</span></a></p>
Marco Lübbecke<p>Job opening at TU Graz: Full Professor Position for Computational Discrete Mathematics <a href="https://mas.to/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a> </p><p><a href="https://jobs.tugraz.at/en/jobs/dec7b342-9f50-f780-b335-67c226f4d322" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">jobs.tugraz.at/en/jobs/dec7b34</span><span class="invisible">2-9f50-f780-b335-67c226f4d322</span></a></p>
Solver Max<p>Locational marginal pricing of potatoes</p><p>We apply Locational Marginal Pricing (LMP) to the supply of potatoes. The article describes the model, calculation of LMPs, and scenarios for how the suppliers and contractors may respond to the price signals.<br /><a href="https://mathstodon.xyz/tags/orms" class="mention hashtag" rel="tag">#<span>orms</span></a> <a href="https://mathstodon.xyz/tags/pyomo" class="mention hashtag" rel="tag">#<span>pyomo</span></a><br /><a href="https://www.solvermax.com/blog/locational-marginal-pricing-of-potatoes" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">solvermax.com/blog/locational-</span><span class="invisible">marginal-pricing-of-potatoes</span></a></p>
Bartolomeo Stellato<p>🚀 Gave a talk at the EURO OSS Seminar Series on "Data-Driven Algorithm Design and Verification for Parametric Convex Optimization"!</p><p>🎥 Recording: <a href="https://euroorml.euro-online.org/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">euroorml.euro-online.org/</span><span class="invisible"></span></a></p><p>Big thanks to Dolores Romero Morales for the invitation! 🙌 <a href="https://mastodon.social/tags/MachineLearning" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MachineLearning</span></a> <a href="https://mastodon.social/tags/Optimization" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Optimization</span></a> <a href="https://mastodon.social/tags/ORMS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ORMS</span></a></p>
Marco Lübbecke<p>Jacques Desrosiers delivered the sad news that an <a href="https://mas.to/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a> giant has left us forever: </p><p>François Soumis passed away last night. The depot of this last vehicle tour is in heaven.</p>
Solver Max<p>Permission granted: A role mining model </p><p>We implement a recently published role mining model using both constraint programming and mixed integer linear programming, then compare their relative performance while solving several examples.<br /><a href="https://www.solvermax.com/blog/permission-granted-a-role-mining-model" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">solvermax.com/blog/permission-</span><span class="invisible">granted-a-role-mining-model</span></a><br /><a href="https://mathstodon.xyz/tags/orms" class="mention hashtag" rel="tag">#<span>orms</span></a> <a href="https://mathstodon.xyz/tags/pyomo" class="mention hashtag" rel="tag">#<span>pyomo</span></a> <a href="https://mathstodon.xyz/tags/ortools" class="mention hashtag" rel="tag">#<span>ortools</span></a> <a href="https://mathstodon.xyz/tags/python" class="mention hashtag" rel="tag">#<span>python</span></a></p>
Solver Max<p>New item in our list of <a href="https://mathstodon.xyz/tags/orms" class="mention hashtag" rel="tag">#<span>orms</span></a> resources:</p><p>Collection of videos from Associate Professor Alberto Del Pia, University of Wisconsin-Madison.<br />There are around 100 videos, collated into playlists relating to specific optimization papers taught at the university.<br /><a href="https://www.solvermax.com/resources/links/online-courses/optimization-nation" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">solvermax.com/resources/links/</span><span class="invisible">online-courses/optimization-nation</span></a></p>
Dirk Van den Poel<p>Today, we are at the 2025 Flanders Make Scientific Conference in Leuven. CVAMO also has several posters at the event. It’s a great event for scientific networking. <a href="https://mastodon.online/tags/FlandersMake" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>FlandersMake</span></a> <a href="https://mastodon.online/tags/ORMS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ORMS</span></a> <a href="https://mastodon.online/tags/MANPROCAD" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MANPROCAD</span></a> <a href="https://mastodon.online/tags/REMASC" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>REMASC</span></a> <a href="https://mastodon.online/tags/CVAMO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CVAMO</span></a></p>
Marco Lübbecke<p>The bugfix release 9.2.1 of the SCIP Optimization Suite is now available.</p><p>This brings updates to GCG, PaPILO, SCIP, and SoPlex:<br>- <a href="https://github.com/scipopt/gcg/blob/v371/CHANGELOG" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/scipopt/gcg/blob/v3</span><span class="invisible">71/CHANGELOG</span></a><br>- <a href="https://github.com/scipopt/papilo/releases/tag/v2.4.1" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/scipopt/papilo/rele</span><span class="invisible">ases/tag/v2.4.1</span></a><br>- <a href="https://github.com/scipopt/scip/releases/tag/v921" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/scipopt/scip/releas</span><span class="invisible">es/tag/v921</span></a><br>- <a href="https://github.com/scipopt/soplex/releases/tag/release-713" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/scipopt/soplex/rele</span><span class="invisible">ases/tag/release-713</span></a></p><p><a href="https://mas.to/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a></p>
Michael Stiglmayr<p>Celebrating the 50th birthday of EURO - the Association of European Operational Research Societies. <a href="https://mathstodon.xyz/tags/orms" class="mention hashtag" rel="tag">#<span>orms</span></a></p>
Marco Lübbecke<p>The Association of European Operational Research Societies (EURO) celebrates its 50th birthday today! <a href="https://mas.to/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a> <a href="https://mas.to/tags/ORawarenessDay" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ORawarenessDay</span></a> <a href="https://mas.to/tags/EURO50thbday" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>EURO50thbday</span></a></p><p><a href="https://buff.ly/40w6fQu" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">buff.ly/40w6fQu</span><span class="invisible"></span></a></p>
Marco Lübbecke<p>one of my master's students displayed (wide and very long) heat maps in his thesis that always looked like knitting patterns to me; I suggested to him to make a scarf out of this.</p><p>well he did. thank you, Alex, for a very very nice gift! <a href="https://mas.to/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a></p>
Solver Max<p>Optimal rational approximation using SciPy </p><p>In this article we solve a non-linear curve fitting problem using the SciPy library. SciPy is especially well-suiting to solving this type of problem, as it includes a variety of functions for fitting and optimizing non-linear functions.</p><p>Along the way, we illustrate how to use SciPy&#39;s curve_fit and minimize functions for this type of task. In addition, we look at some good practices to apply when solving this type of problem.<br /><a href="https://mathstodon.xyz/tags/python" class="mention hashtag" rel="tag">#<span>python</span></a> <a href="https://mathstodon.xyz/tags/scipy" class="mention hashtag" rel="tag">#<span>scipy</span></a> <a href="https://mathstodon.xyz/tags/orms" class="mention hashtag" rel="tag">#<span>orms</span></a><br /><a href="https://www.solvermax.com/blog/optimal-rational-approximation-using-scipy" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">solvermax.com/blog/optimal-rat</span><span class="invisible">ional-approximation-using-scipy</span></a></p>
Dirk Van den Poel<p>Heading to Vancouver, BC (Canada) for the <a href="https://mastodon.online/tags/NeurIPS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NeurIPS</span></a> Conference to represent Ghent University’s Data Science for Business Program @NeurIPSConf <a href="https://mastodon.online/tags/GenAI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GenAI</span></a> <a href="https://mastodon.online/tags/AI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AI</span></a> <a href="https://mastodon.online/tags/GenerativeAI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GenerativeAI</span></a> <a href="https://mastodon.online/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a> <a href="https://mastodon.online/tags/DataScience" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DataScience</span></a> <a href="https://mastodon.online/tags/DS4B" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DS4B</span></a> <a href="https://mastodon.online/tags/NeurIPS24" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NeurIPS24</span></a></p>
Dirk Van den Poel<p>Today’s Session of my Big Data Analytics Class is a guest lecture by Element61 professionals discussing ML projects in the real world. It has become a yearly tradition. <a href="https://mastodon.online/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a> <a href="https://mastodon.online/tags/DS4B" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DS4B</span></a> <a href="https://mastodon.online/tags/DataScience" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DataScience</span></a> <a href="https://mastodon.online/tags/DataAnalytics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DataAnalytics</span></a> <a href="https://mastodon.online/tags/Datalake" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Datalake</span></a> <a href="https://mastodon.online/tags/AzureDataFactory" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AzureDataFactory</span></a> <a href="https://mastodon.online/tags/orchestration" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orchestration</span></a> tool <a href="https://mastodon.online/tags/Azure" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Azure</span></a></p>
Solver Max<p>Article: Can AI code an entire optimization model?</p><p>In this article we pursue an ambitious goal: Create an entire, non-trivial optimization model using Artificial Intelligence (AI).</p><p>Our approach mimics a user who is familiar with the situation, and has some experience with formulating optimization models, but is not familiar with implementing an optimization model in Python code. We want the AI to do all the coding for us.</p><p>We report our experience of using Copilot to write a model for us. Rather than presenting a verbatim transcript, which is very long, we focus on what went well and what didn&#39;t go well as the model evolves. We also summarize general lessons from the process.</p><p><a href="https://www.solvermax.com/blog/can-ai-code-an-entire-optimization-model" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">solvermax.com/blog/can-ai-code</span><span class="invisible">-an-entire-optimization-model</span></a></p><p><a href="https://mathstodon.xyz/tags/copilot" class="mention hashtag" rel="tag">#<span>copilot</span></a> <a href="https://mathstodon.xyz/tags/Python" class="mention hashtag" rel="tag">#<span>Python</span></a> <a href="https://mathstodon.xyz/tags/orms" class="mention hashtag" rel="tag">#<span>orms</span></a> <a href="https://mathstodon.xyz/tags/optimization" class="mention hashtag" rel="tag">#<span>optimization</span></a> <a href="https://mathstodon.xyz/tags/modelling" class="mention hashtag" rel="tag">#<span>modelling</span></a> <a href="https://mathstodon.xyz/tags/highs" class="mention hashtag" rel="tag">#<span>highs</span></a></p>
Robert Bassett<p>GASP!</p><p>Gurobi withdrew from the Mittleman benchmarks: <a href="https://plato.asu.edu/bench.html" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://</span><span class="">plato.asu.edu/bench.html</span><span class="invisible"></span></a></p><p><a href="https://mathstodon.xyz/tags/optimization" class="mention hashtag" rel="tag">#<span>optimization</span></a> <a href="https://mathstodon.xyz/tags/orms" class="mention hashtag" rel="tag">#<span>orms</span></a></p>
Jip J. Dekker<p>Because of our Eureka Prize nomination, the MiniZinc team was interviewed by the ARDC. Learn about some MiniZinc projects, and our perspective on MiniZinc and its development: <a href="https://ardc.edu.au/article/shaping-research-software-an-interview-with-the-minizinc-team/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">ardc.edu.au/article/shaping-re</span><span class="invisible">search-software-an-interview-with-the-minizinc-team/</span></a></p><p><a href="https://hachyderm.io/tags/MiniZinc" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MiniZinc</span></a> <a href="https://hachyderm.io/tags/Development" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Development</span></a> <a href="https://hachyderm.io/tags/SoftwareEngineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SoftwareEngineering</span></a> <a href="https://hachyderm.io/tags/ConstraintModelling" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ConstraintModelling</span></a> <a href="https://hachyderm.io/tags/ORMS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ORMS</span></a> <a href="https://hachyderm.io/tags/Optimization" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Optimization</span></a></p>
Marco Lübbecke<p>advent of operations research <a href="https://mas.to/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a></p><p><a href="https://advent.bmenendez.com/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">advent.bmenendez.com/</span><span class="invisible"></span></a></p>
Marco Lübbecke<p>Mixed Integer Programming European Workshop 2025, Clermont-Ferrand, France, July 1-3, 2025 <a href="https://mas.to/tags/orms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>orms</span></a></p><p><a href="https://www.mixedinteger.org/EUROMIP/2025/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">mixedinteger.org/EUROMIP/2025/</span><span class="invisible"></span></a></p>
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