Multigene Genetic Programming for Estimation of Elastic Modulus of Concrete

Table 1

Parameter settings for the MGGP algorithm.

Parameter	Settings
Population size	200, 500, 1000
Number of generations	200, 500, 1000
Maximum number of genes allowed in an individual	1, 3, 6
Maximum tree depth	4, 6
Tournament size	12
Elitism	0.01% of population
Crossover events	0.1, 0.85
High level crossover	0.2
Low level crossover	0.8
Mutation events	0.1, 0.85
Subtree mutation	0.9
Function set	+, −, ×, /, ✓, exp, ln, sin, cos