parameter setting
Answered
Excuse me, my gurobi version is Gurobi 9.1.2, which is on the Linux environment.
If i do not set any parameter, the test program is properly solved.
After setting the parameters, you can indeed see that the parameters in sdpsettings have been modified. TuneTimeLimit is also 0, but it still can't be solved properly,which is the same situation in the complex program.
The version of Yalmip and MATLAB is below.
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Hi Richard,
I can't explain what might be happening here. Can you write a log to file (using the LogFile parameter) and check to see whether it is also missing any expected contents?
You don't have to worry about TuneTimeLimit, it is not relevant as it is only used when using the parameter tuning tool.
- Riley
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Dr. Clement,
Thanks for your answer. I used the logfile parameter and generate the file named 1028. And it really missed many contents. It is obviously that this problem has solution. Now i do not konw how to fix this problem.
-Richard
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Hi Richard,
This is quite confusing and I have no explanation. My ability to debug is also limited by the fact that YALMIP is a 3rd party tool. Do you know if there is any way to see the Status Code using YALMIP?
I think it would be worth upgrading Gurobi to the latest version (9.1.2 is quite old and no longer supported) and see if the problem persists.
- Riley
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It might also be worth asking the yalmip community if they have seen this problem before:
https://groups.google.com/g/yalmip0 -
Hi Dr.Clement,
The status code of this problem in YALMIP is 9. And it provides some infomation in sol.info:
Unknown problem (<a href="yalmip.github.io/inside/debug">learn to debug</a>) (Unknown problem (<a href="yalmip.github.io/inside/debug">learn to debug</a>) (Error using gurobiGurobi error 10008: Unable to set parameter CrossoverBasis to value -1 (minimum is 0))).
Maybe i should debug this first and then update Gurobi.Thanks for your answer. It really helps me a lot.
-Richard
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Ah this makes sense now. If you look at the reference for CrossoverBasis in v9.1 the default value was 0, and this was the lowest value this parameter could take. This was changed in the next release v9.5. The default, and lower value, for CrossoverBasis in v9.5 is -1.
It seems your version of YALMIP is incompatible with Gurobi v9.1. The YALMIP documentation should really make it clear which versions of YALMIP are compatible with which versions of Gurobi, but I suppose this is a lot of work for them. My advice is to upgrade to the latest version of Gurobi (v11.0.3) and this problem will go away.
- Riley
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Hi Dr.Clement,
Thanks a lot! Upgrading is a little complex under Linux system.
By debugging the info, and omment out some useless parameters in warning. The problem can be solved after setting parameter.
-Richard
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