Today (10 Dec 2020) was a big day for OpenSolver, as we rolled past the 500,000 downloads count. Many thanks to all our Engineering Science (University of Auckland) students who have worked on this over the last decade, with a really large thank you to Jack Dunn for his major contributions over many years (including creating the Mac version). The community feedback is also much appreciated – thanks for letting us know of issues and suggesting enhancements. Cheers, Andrew
ResearchGate let me know today that OpenSolver is being used to help allocate mental health personnel in the US Navy.
Most of our OpenSolver users choose the standard integer programming solver, CBC (which is the default option). COIN-OR, the non-profit who support and develop CBC, have just announced a new support forum for CBC users. (This is a beta test of the new GitHub discussion forums being developed.) This is the best place for advanced users to take technical questions, such as queries about CBC parameters (which OpenSolver supports). Andrew
We have now released OpenSolver 2.9.3 for beta testing! You can download this new version of OpenSolver on https://sourceforge.net/projects/opensolver/files/. Below are the release notes that cover the changes made in this new version of OpenSolver:
v2.9.3 – 2020/03/02
- Added support for using Gurobi 9.0
- Added a temp fix for running consecutive operations on Excel64bit
- Add support for NEOS CPLEX as a new solver.
- Add import LP file feature.
- Add Examples files and submenu.
- Fix memory error when solving consecutive non-linear models in 64bit.
As always, we welcome any feedback! Please comment below if it works ok, or if there are any issues encountered, or if you have any questions regarding the new release. Thanks!
12 Feb 2020: It was raised to us that OpenSolver for GoogleSheets is still unaccessible to new users. We are now able to replicate this bug. From our tests, new user accounts are able to install OpenSolver for Google Sheets as an Add-on from Chrome Web Store. However, the “Sign in with Google is temporarily disabled for this app” screen will still show up when trying to open the sidebar from the ribbon. We are very sorry for the inconvenience and we have contacted Google regarding this issue. We need to wait for Google’s response on this, therefore we are unsure of when this problem will be fixed.
Original post: Changes made by Google mean that OpenSolver for Googlesheets is currently not working for new users who want to add it to their Googlesheets. (Apparently the first 100 users each month can sign in, but then further sign ins are blocked by Google.) We are working on fixing this, But we don’t know how long it will take, sorry. We suggest you use OpenSolver for Excel until we get it working properly for Googlesheets.
Sorry for the inconvenience.
Google has a nice article here, that includes a recommendation to use OpenSolver. Enjoy!
We justc ame across an interesting article using OpenSolver to help develop optimal policies for conservation.
Commonalities in stream connectivity restoration alternatives: an attempt to simplify barrier removal optimization
OpenSolver reached another download milestone this month. If my car had reached 300,000 on the dial, I’d be looking at getting a new one. Fortunately, OpenSolver gets better with age.
Thank to all our users for their support.
There’s a great overview of software available for optimisation in Optima (volume 103, 2017), the Mathematical Optimization Society Newsletter.
Today the download odometer rolled past another milestone:
Thanks to all our users and our development team (and most recently Jack Dunn) for supporting OpenSolver for the last 6 years. None of this would have been possible without the solvers from COIN-OR; thanks to John Forrest and Ted Ralphs for the many years of CBC development, without which the OpenSolver project would never have started.
This blog by Derek Nelson shows how he built an OpenSolver model for fantasy football that worked well for him. “My optimizer was created using Excel with the Open Solver add-in. This worked for me and the results were good. Namely, I had the highest projected points for my teams at the start of the season in both leagues I played in (the best you can hope for in the draft, in my opinion), and I ended the season by winning one league and placing second in the other.”
Derek has now gone on to create a cloud-based version of this. This work is an interesting optimisation-based project.
As this video shows, yes, OpenSolver can solve Sudoku…
A nice article here by Jangho Lee, Seoul National University, on a Statistical Approach for Clustering Member of Congress in South Korea. Jangho used Python, Excel and Gephi for visualizing.
Image from http://jangholee.org/?p=57