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I just want to explain that I'm super new to python I want to acces the results from my problem:

I have this, and its running I just want to access my results so that I can compare the two types of batteries that I have How can I have the Results for B1 and for B2 that is being solved for?

Here is one of my variables declared:

model.ach = Var(model.t , domain=NonNegativeReals, bounds=(0,1)) #Rate of charging

Here is a dictonary to build the demand

demand = Jan[:24*4*5]
t = range(len(demand))
demand_dict = {}
for tt, dd in zip(t, demand):
demand_dict[tt] = dd

Here is declared fixed values:

 cosP = 12.34
 cosE=0.0606
 cosF=0.02673

After my objective function is declared in my abstract model I use a class to have different kinds of Batteries:

class Battery:
      def __init__(self, n, Emax, Emin, cap):
      self.n=n
      self.Emax=Emax
      self.Emin=Emin
     self.cap=cap


B1=Battery(0.8,3800,400,500)
B2=Battery(0.8,7600,800,1000)
Batts=[B1,B2]

Now I'm interating through the two classes my model 

Results=[]
Instance=[]
for b in Batts:
        data = {None: {'cosP': {None: cosP},
               't': {None: t},
               'cosE': {None: cosE},
               'cosF':{None:cosF},
               'n':{None: b.n},
               'Emax':{None:b.Emax}, #kWh max capacity
               'Emin':{None:b.Emin}, #kWh min capacity
               'cap':{None:b.cap},
               'dem': demand_dict
              }
        }
        instance=model.create_instance(data)
        opt=SolverFactory('glpk')
        results = opt.solve(instance)
Results.append(results)
Instance.append(instance)

I'm, trying to access for example a value previously delcared ach I tried this:

for t in instance.t:
    ach.append(instance.ach[t].value)

But that only gives me acces to the last runt i.e b2 in Battery. How do I access other values assuming I might have multiples b's

Laura Magallanes
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  • Hi, I think you need to fix the indentation in your question, it will make it much easier to understand what your are trying to do. I assume the last 5 lines should be part of the for loop. Also, you should clarify _what_ results (i.e. what variables) you are trying to look at, and what they are indexed on. – Giorgio Balestrieri Jul 16 '19 at 23:44
  • Hi Giorgio, you are right, I'm trying to access dem from Battery 1 or 2. I know how to do it without a Class defyining my batteries, but since I have multiple batteries i dont want to have this code multiple times, thank you :) – Laura Magallanes Jul 17 '19 at 16:04
  • Is `results = opt.solve(instance)` on the same indentation than `Results.append(results)`? If they are the way they are, only the last `results` and the last `instance` will be added to your `Results` and `Instance` lists. Also, you would need to add another `for` block at the top of your `for t in instance.t:`, to have something like `for instance in Instance:`, if you want to run the action in your `for`block for all saved instances. – V. Brunelle Jul 17 '19 at 17:17

1 Answers1

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When you want to get the result of one of your variable, simply do

print(instance.X[indice1, indice2].value) #for indexed var objects

or 

print(instance.X.value) #for non-indexed var objects

where indice1 and indice2 are the indices that is part of your variable index, and where X is the name of your variable.

The use of print is only to show the result, and the value of your variable can be used in Python directly if you don't use print.

Edit: If you want to access the value of all variables, I recommend you the following question: Pyomo: Access Solution From Python Code

V. Brunelle
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