The bounded polynomial mutation operator is a realparameter genetic operator. Like in the simulated binary crossover operator, the probability distribution is also a polynomial function instead of a normal distribution.
1  boundedPolyMutation(parent_chromosome, lowerBounds, upperBounds, mprob, mum)

parent_chromosome 
Mating pool with decision variables 
lowerBounds 
Lower bounds of each decision variable 
upperBounds 
Upper bounds of each decision variable 
mprob 
Mutation probability 
mum 
Mutation distribution index, it can be any nonnegative real number 
Return the offspring population with decision variables
ChingShih (Vince) Tsou cstsou@mail.ntcb.edu.tw
Deb, K., Pratap, A., Agarwal, S., and Meyarivan, T. (2002), " A fast and elitist multiobjective genetic algorithm: NSGAII", IEEE Transactions on Evolutionary Computation, 6(2), 182197.
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