Originally posted by: amindehghanian

Hi,

I need to update so parameters in my branch callback and use them in my cutcallback function of the offsprings. However I let CPLEX use its default branching, then I am not able to use userhandle of CPXbranchcallbackbranchbds.

How I can get over this issue efficiently?

Thanks in advance!

Do you use CPXbranchcallbackbranchasCPLEX to implement CPLEX's branching choices? It has a 'userhandle' argument.

Paul

Originally posted by: amindehghanian

Thanks Paul for you quick answer!

I could do it, however I prefer not to!

I want to let CPLEX choose the branching variable. 

Is there any possible way to find out the last variable being fixed in the search tree?

Thanks again,

"I want to let CPLEX choose the branching variable." Isn't that exactly what CPXbranchcallbackbranchasCPLEX does?

Originally posted by: amindehghanian

You mean I can put the arguments of variables  to be NULL in CPXbranchcallbackbranchbds?

I did not know that!

Thanks

No, I mean you can use CPXbranchcallbackbranchasCPLEX instead of CPXbranchcallbackbranchbds. CPXbranchcallbackbranchasCPLEX tells CPLEX to create one of the branches it was planning to create in the absence of a branch callback. You will probably want to call it twice, once with num=0 (create the left child) and again with num=1 (create the right child). Please refer to the documentation for CPXbranchcallbackbranchasCPLEX.

Paul

Originally posted by: amindehghanian

Yes, you are right!

Thanks a lot,