getSecondParents: Get Second Parent

In GilChrist19/GA: Perform lm() or glm() Implemented Within a Genetic Algorithm

Description

Generates a list of parents to breed with the first parents selected. Makes sure that a parent is not breeding with itself. Called within the Breed() function

Usage

getSecondParents(firstParents, method, nPop, relScore)

Arguments

firstParents	List of the first parents in each mating.
method	One of two scoring methods to determine the second parent. oneScore: Second parent is chosen at random. twoScore: Second parent is chosen based on relative fitness.
nPop	Number of chromosomes in the population. Equal to the length of firstParents.
relScore	Relative fitness score as calculated by Fitness(). Lower is better.

Details

This function ensures that the second parent in a crossover is distinct from the first. It uses one of two methods to determine the second parent. This will be slower than randomly picking the second parent but could provide better performance. Function assumes that the worse member of the previous generation has already been removed.

Value

A vector indicating the row position in the population matrix of the parents that will breed with the firstParents vector.

Examples

set.seed(42)
test_parent1 <-  matrix(data = sample(c(0,1), size = 16, replace = TRUE), nrow = 4, ncol = 4)
test_nPop <- length(test_parent1)
test_relScore <- rnorm(x = 4, mean = 10, sd = 1)
getSecondParents(firstParents=test_parent1, method="oneScore", nPop=4, relScore=test_relScore)

GilChrist19/GA documentation built on May 13, 2019, 5:32 p.m.