Hi @HosseinMehdipour. For CONOPT and other nonlinear solvers it suffices to assign the initial solution to the variables in AIMMS. The solution will then automatically be used as a starting solution by the solver.

(For Knitro you have to make sure that the Knitro option 'Use Initial Solution’ is switched on, which it is by default.)

@HosseinMehdipour 

Was Marcel’s answer able to help you with your problem?

Thank you @Marcel Hunting for your response. I tried that. But I could not assign the initial solution to the variable! Could you please tell me how to do that?

@Andrew I tried an another way, I defined a parameter that represents the initial solution of the specific variable and assign this parameter to the variable just before the solve command in the Mainexecution page. @Marcel Hunting could you please tell me if this way of assigning initial solution is correct?

Thank you

Regards

If X(i) is a variable then you can use

   X(i) := 10;

or

   X(i) := P(i);

where P is a parameter. You should use such a statement before the solve statement.