xegaGpAllCross2Gene: Crossover of 2 derivation tree genes.

In xegaGpGene: Genetic Operations for Grammar-Based Genetic Programming

Crossover of 2 derivation tree genes.

Description

xegaGpAllCross2Gene() swaps two randomly extracted subtrees between 2 genes. Subtrees must have the same root in order to be compatible. The current implementation performs at most lF$MaxTrials() trials to find compatible subtrees. If this fails, the original genes are returned.

Usage

xegaGpAllCross2Gene(ng1, ng2, lF)

Arguments

ng1	Derivation tree.
ng2	Derivation tree.
lF	Local configuration of the genetic algorithm.

Details

Crossover is controlled by one local parameter:

• lF$MaxTrials(): Maximal number of trials to find compatible subtrees. If compatible subtrees are not found, the gene is returned unchanged.

Value

List of 2 derivation trees.

See Also

Other Crossover: xegaGpAllCrossGene(), xegaGpFilterCross2Gene(), xegaGpFilterCrossGene()

Examples

gene1<-xegaGpInitGene(lFxegaGpGene)
gene2<-xegaGpInitGene(lFxegaGpGene)
xegaGpDecodeGene(gene1, lFxegaGpGene)
xegaGpDecodeGene(gene2, lFxegaGpGene)
newgenes<-xegaGpAllCross2Gene(gene1, gene2,  lFxegaGpGene)
xegaGpDecodeGene(newgenes[[1]], lFxegaGpGene)
xegaGpDecodeGene(newgenes[[2]], lFxegaGpGene)

xegaGpGene documentation built on June 10, 2025, 9:14 a.m.