package net.bmahe.genetics4j.samples.clustering;
   
   import java.util.Objects;
   
   import org.apache.commons.lang3.Validate;
   
   import net.bmahe.genetics4j.core.Genotype;
   import net.bmahe.genetics4j.core.chromosomes.DoubleChromosome;
   
  public class PhenotypeUtils {
  
  	// tag::to_phenotype[]
  	public static double[][] toPhenotype(final Genotype genotype) {
  		Objects.requireNonNull(genotype);
  		Validate.isTrue(genotype.getSize() > 0);
  
  		final var doubleChromosome = genotype.getChromosome(0, DoubleChromosome.class);
  
  		final int numClusters = doubleChromosome.getSize() / 2;
  		final double[][] clusters = new double[numClusters][2];
  
  		for (int i = 0; i < numClusters; i++) {
  			clusters[i][0] = doubleChromosome.getAllele(i * 2);
  			clusters[i][1] = doubleChromosome.getAllele(i * 2 + 1);
  		}
  
  		return clusters;
  	}
  	// end::to_phenotype[]
  }