Appling the Roulette Wheel Selection Approach to Address the Issues of Premature Convergence and Stagnation in the Discrete Differential Evolution Algorithm

Algorithm 1

Nonmatching degree.

	Input: Best solution and current solutions πi
	Output: Nonmatch degree
	Nonmatch = 0
	For each facility in the current solutions πi
	If the location of the facility not-match in and πi
	Nonmatch = nonmatch + 1
	End if
	End For