Genetic Operations for Grammar-Based Genetic Programming R package xegaGpGene version 1.0.0.3 An implementation of the representation-dependent gene level operations of grammar-based genetic programming with genes which are derivation trees of a context-free grammar: Initialization of a gene with a complete random derivation tree, decoding of a derivation tree. Crossover is implemented by exchanging subtrees. Depth-bounds for the minimal and the maximal depth of the roots of the subtrees exchanged by crossover can be set. Mutation is implemented by replacing a subtree by a random subtree. The depth of the random subtree and the insertion node are configurable. For details, see Geyer-Schulz (1997, ISBN:978-3-7908-0830-X). Software Imports: stats, xegaBNF (> 1.0.0.4), xegaDerivationTrees, xegaSelectGene Suggests: testthat Andreas Geyer-Schulz <Andreas.Geyer-Schulz@kit.edu> Comprehensive R Archive Network (CRAN) Andreas Geyer-Schulz [aut, cre] (ORCID: <https://orcid.org/0009-0000-5237-3579>) MIT + file LICENSE (https://CRAN.R-project.org/package=xegaGpGene/LICENSE) 2025-08-22 application/tgz https://CRAN.R-project.org/package=xegaGpGene doi:10.32614/CRAN.package.xegaGpGene