Originally posted by: felycite28

Hello  everyone ,

I am coding  my heuristic algorithm on python . I got confused a bit with changing the variable for objective function. Basically what I am trying to do is . I have an objective function value already and trying to do

def (objective value)

     do task a

     calculate objcetive function again lets say new value will be newobj

     if newobj<objective value

         do task  a

   else :

   do not do anything

I should change the objective function at each iteration by decreasing it and compare it with the previous value of objective value . As long as obj.value decreases , I should do task a basically.

I tried to change the variables but did not work somehow;

Thank you so much for any help in advance

It would be much easier to understand your problem if you posted the code that is supposed to modify the value.

My very wild guess is that you have something like this:

def myfunc(objval):
    if newobj < objval:
        objval = newobj

Is that what you have? If so, then this cannot work since changes to 'objval' are not visible outside the function. 'objval' is passed by value into 'myfunc'.

On easy way around this would be to return 'objval' from 'myfunc' and then call it as

objval = myfunc(objval)

In any case, this seems more a Python problem than a CPLEX problem?