How to add conditionals in quicksum for loop?

Answered

scott zheng

November 21, 2023 15:08

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Hi there,

I have a constraint like this one.

When I try to add (and j!=i) to the gurobi model, it shows j is not defined. How do I solve this problem?

        for i in range(self.noCells):
            for t in range(self.noHours - 1):
                self.model.addConstr(
                    self.alpha * self.SoH[i, t] * self.soc[i, t] +
                    quicksum(self.gcrPower[l] * self.g[i, t, l] for l in range(self.noL)) / self.noCells +
                    quicksum(self.solPower[m] * self.r[i, t, m] for m in range(self.noM)) / self.noCells -
                    quicksum(self.dcrPower[n] * self.d[i, t, n] for n in range(self.noN)) / self.noCells +
                    quicksum(self.b_plus[j, i, t] for j in range(self.noCells) and j!=i) -
                    quicksum(self.b_minus[i, j, t] for j in range(self.noCells) and j!=i) -
                    self.SoH[i, t+1] * self.soc[i, t+1] == 0
                )

 

Thanks.

 

 

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• 

  Michel Soares

  November 21, 2023 18:55

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  Hi Scott,

  You may try doing this instead:

  quicksum(self.b_plus[j, i, t] for j in range(self.noCells) if j!=i) -
                      quicksum(self.b_minus[i, j, t] for j in range(self.noCells) if j!=i)

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  scott zheng

  November 22, 2023 02:27

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  U r the most clever. That really makes sense.

  Thank you, Michel

   

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