Originally posted by: savant_ning

 now I had a new question... see my attachment

I have 4 decision variables now, and control a linear_constraint, but it doesn't work...

Do I have too many decision variables?

thx

According to your backtrace the problem is not with linear_constraints but with indicator_constraints. The function call looks wrong to me. You have 4 indicator variables, so you will have to create 4 constraints in your call. But you only have one sense, one rhs and one lin_expr. Something does not add up.

Originally posted by: savant_ning

okay, thx

I had fix this problem... it means use indicator_constraints, the indicator variables and constraints and others(including sense, rhs, lin_expr) must have the same length?

Sorry, I don't get your question. But it might be a good idea to look at the reference documentation and the examples therein. This should explain how to use these functions.

Originally posted by: savant_ning

This code had run about 5-6 hours at this print, and the memory  has been occupied. is it work normally?

thx~

Uhm, how would we know whether a long running time is expected for your model or not? The code snippet you posted does not give a lot of clues about your model or its size.