Multi-Item Multiperiodic Inventory Control Problem with Variable Demand and Discounts: A Particle Swarm Optimization Algorithm

Pseudocode 1

The pseudocode of MOPSO algorithm.

for 𝑖=1 to Pop

 initialize position (𝑖)

 initialize velocity (𝑖)

 if position (𝑖) and velocity (𝑖) be a feasible candidate solution

  penalty = 0

 else penalty = a positive number

 end if

end for

𝑤=[0.4,0.9]

do while Iter <= Gen

 for 𝑗=1 to Pop

  Calculate new velocity of the particle

  Calculate new position of the particle

  𝑝best(iter) = min(𝑝best(𝑖))

 end for

 𝑔best(iter) = min(𝑔best)

 𝑤=𝑤_max−((𝑤_max−𝑤_min)/iter_max) × iter

 modifying the velocity and position of the particle

end while