Research Article

Modeling of Drilling Forces Based on Twist Drill Point Angles Using Multigene Genetic Programming

Table 4

Parameters for MGGP ().

ParametersSetting values

Population size400
Number of generations150
Lexicographic selectionTrue
Max tree depth4
Max nodes per treeInf
Functional settimes, minus, plus, pdivide, sin, cos, exp, mypower
Terminal setNumber of inputs: 6, constants range: [−10 10]
Max genes 3
Using fitness functionregressmulti_fitfun.m
Crossover probability0.85
Reproduction probability0.10
Mutation probability0.05