code: def compute_flows(self):
          
          system = self.system
          config = self.config
          dae = system.dae
  
          if config.compute_flows:
              # compute and append series injections on buses
  
              exec(system.call.bus_injection)
              bus_inj = dae.g[:2 * system.Bus.n]
  
              exec(system.call.seriesflow)
              system.Area.seriesflow(system.dae)
              system.Area.interchange_varout()
              dae.y = matrix([
                  dae.y, bus_inj, system.Line._line_flows, system.Area.inter_varout
              ])
docs: If enabled, compute the line flows after each step
  
          Returns
          -------
          None