Steven Shechter
- Total activity 12
- Last activity
- Member since
- Following 0 users
- Followed by 0 users
- Votes 1
- Subscriptions 2
Activity overview
Latest activity by Steven Shechter-
Steven Shechter commented,
Hi Eli, I just wanted to follow up on this and see if you were able to find out what the issue might be? Thank you! Steven
-
Steven Shechter commented,
Sure. The MPS file for the version that fixes the 48 integer variables at pre-determined values is here: https://drive.google.com/file/d/1DJKiieKbyhwBoda0LBkumJAXZiEQC5su/view?usp=sharing and the...
-
Steven Shechter commented,
Hi Eli, I'm actually running into similar problems again as described above, even for the 9.5.0 version of Gurobi. Same situation, where the "optimal" solution returned by Gurobi is worse (by two o...
-
Steven Shechter commented,
Thank you, Eli! That did the trick. I was using version 9.1.2. The problem no longer appears after I updated to version 9.5.0. Was the problem in 9.1.2 related to my model's use of non-convex q...
-
Steven Shechter commented,
sorry, the differences link should instead be: https://docs.google.com/document/d/1NePZgZ0PcSFUG8Mwh0byCEQAs0KNJIKLEdA1iR9g5GA/edit?usp=sharing
-
Steven Shechter commented,
Thank you, Jaromil. I don't see how to upload a file, but here are links to google docs with the .lp outputs. These are long files, but I ran a "compare" of these in Word and confirmed that the on...
-
Steven Shechter created a post,
Why is Gurobi returning MIP solution with gap of 0 which is not close to the actual optimal solution?
OngoingUsing the below code and the following two .csv files, Gurobi returns an optimal solution of 62.42 when the parameter SET_SOME_VARS is set to 0, but returns a much better solution (of 12.32) when i...
-
Steven Shechter commented,
NM...i see that I can fix this by not putting the params as part of the model list, and instead running it as an input to the gurobi(,) call as follows: params <- list(NonConvex=2) result <- gurobi...
-
Steven Shechter created a post,
How to set NonConvex = 2 in Gurobi in R?
AnsweredI get this error when I run the MWE code below. Does anyone know how to resolve this? thanks! Error: Error 10020: Q matrix is not positive semi-definite (PSD). Set NonConvex parameter to 2 to sol...