A Novel Resource-Leveling Approach for Construction Project Based on Differential Evolution

Algorithm 1

The differential evolution algorithm.

Initialize population of NP individuals

Do

      For each individual 𝑗 in the population

               Generate three random integers 𝑟₁, 𝑟₂, and 𝑟₃∈(1,NP)

               with 𝑟₁≠𝑟₂≠𝑟₃≠𝑗

               Generate random integer 𝑖_rand∈(1,𝐷)

               For each parameter 𝑖

                         𝑈_{𝑗,𝑖,𝑔}=𝑋_{𝑗,𝑟3,𝑔}+𝑓×𝑋_{𝑗,𝑟1,𝑔}−𝑋_{𝑗,𝑟2,𝑔}ifrand_𝑗()𝑋0,1<Cror𝑗=𝑟𝑛𝑏(𝑖)_{𝑗,𝑖,𝑔}otherwise

               End For

               Replace 𝑋_𝑖 with the offspring 𝑈_𝑖 if 𝑈_𝑖 is better

         End For

Until the stopping condition is met