Sonja Mars

A few remarks/questions: How "negative" is the eigenvalue that is not cut off? Numerical issues happen quite frequently when it comes to SDPs. Also, how are you computing it? From your code, it se...

In what kind of callback are you adding them? So what is the "WHERE" value?   Your last sentence really points to numerical issues. That is not so uncommon when solving SDPs. How do your lazy const...

You can simply look at the X attribute of your variables. Here is an example of how to do this in Python. Before accessing the X attribute, please make sure to check if a solution is available. If ...

That is an interesting approach. I actually did something very similar for my PhD thesis a couple of years ago. Just out of curiosity, how are you calculating the lazy constraints, what routines ar...

That is strange, indeed. Have you changed anything? For example, upgraded/updated Python, updated Gurobi? Can you do ls -la /Library/gurobi901/mac64/bin  and post the output? Best,   Sonja

Please see here.

From a performance point of view the fewer layers you have in between your data and Gurobi the faster it is. So C# will be a faster choice than AIMMS. However, it depends also on the structure of y...

I am not familiar with this error message. Can you give us some more details of your setup? For example, what kind of license are you using? Best,   Sonja  

I am not sure I understand: if the solution violates the constraints it is not feasible anymore, isn't it? However, you can fix the upper and lower bounds of your variables to the values of the sol...

No, this is not possible via an attribute. You can, of course, count them on your own. However, the issue with this is that you sometimes have to add the same lazy constraint more than once. How wo...