Modelling of the Elasticity Modulus for Rock Using Genetic Expression Programming

Table 4

GEP parameters used for the developed model.

Parameter definition	GEP model
Program size	95
Literals	23
Number of generations	10,024,415
Arithmetic operators	+, −, , /
Mathematical functions	Inv, sgrt, 3Rt, 4Rt, 5Rt, , , , , arctangent and hyperbolic tangent
Number of chromosomes	20
Head size	17
Tail size	18
Gene size	53
Number of genes	4
Linking function	Multiplication
Mutation rate	0.00138
Inversion rate	0.00546
One-point recombination rate	0.00277
Two-point recombination rate	0.00277
Gene recombination rate	0.00277
Gene transposition rate	0.00277