From a757deacded0d7357a9f68462d3f2051e16004ee Mon Sep 17 00:00:00 2001
From: Eduardo Pedroni <ep625@york.ac.uk>
Date: Mon, 31 Mar 2014 20:32:59 +0100
Subject: Need to do a few tests on windows

---
 src/jcgp/modules/ea/MuPlusLambda.java | 80 +++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/jcgp/modules/ea/MuPlusLambda.java

(limited to 'src/jcgp/modules/ea/MuPlusLambda.java')

diff --git a/src/jcgp/modules/ea/MuPlusLambda.java b/src/jcgp/modules/ea/MuPlusLambda.java
new file mode 100644
index 0000000..94900ca
--- /dev/null
+++ b/src/jcgp/modules/ea/MuPlusLambda.java
@@ -0,0 +1,80 @@
+package jcgp.modules.ea;
+
+import java.util.HashMap;
+
+import jcgp.JCGP.Resources;
+import jcgp.modules.ModuleStatus;
+import jcgp.modules.mutator.Mutator;
+import jcgp.parameters.IntegerParameter;
+import jcgp.parameters.Parameter;
+import jcgp.population.Chromosome;
+import jcgp.population.Population;
+
+/**
+ * (μ + λ) EA.
+ * 
+ * 
+ * @author Eduardo Pedroni
+ *
+ */
+public class MuPlusLambda implements EvolutionaryAlgorithm {
+	
+	private Chromosome fittestChromosome;
+	
+	private IntegerParameter parents, offspring;
+	
+	private HashMap<String, Parameter> localParameters;
+	
+	public MuPlusLambda() {		
+		parents = new IntegerParameter(1, "Parents");
+		offspring = new IntegerParameter(4, "Offspring");		
+		
+		localParameters = new HashMap<String, Parameter>();
+		
+		localParameters.put("mu", parents);
+		localParameters.put("lambda", offspring);
+	}
+
+	@Override
+	public void evolve(Population population, Mutator mutator, Resources parameters) {
+		// select fittest chromosome
+		int fittest = 0;
+		
+		for (int i = 1; i < parameters.getInt("popSize"); i++) {
+			if (population.getChromosome(i).getFitness() >= population.getChromosome(fittest).getFitness()) {
+				fittest = i;
+			}
+		}
+		fittestChromosome = population.getChromosome(fittest);
+		population.setBestIndividual(fittest);
+		// create copies of fittest chromosome, mutate them
+		Chromosome fc = population.getChromosome(fittest);
+		for (int i = 0; i < parameters.getInt("popSize"); i++) {
+			if (i != fittest) {
+				population.getChromosome(i).copyConnections(fc);
+				mutator.mutate(population.getChromosome(i), parameters);
+			}
+		}
+	}
+
+	@Override
+	public Chromosome getFittestChromosome() {
+		return fittestChromosome;
+	}
+
+	@Override
+	public HashMap<String, Parameter> getLocalParameters() {
+		return localParameters;
+	}
+
+	@Override
+	public String toString() {
+		return "(μ + λ)";
+	}
+
+	@Override
+	public ModuleStatus getStatus(Resources resources) {
+		return ModuleStatus.READY;
+	}
+	
+}
-- 
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