com.rubecula.darwin.examples.travelingsalesman
Class Mortality_TS

java.lang.Object
  net.sf.tostring0.AToString
      com.rubecula.darwin.domain.genetics.Mortality_
          com.rubecula.darwin.examples.travelingsalesman.Mortality_TS

All Implemented Interfaces:

Mortality, net.sf.tostring0.IToString

public class Mortality_TS
extends Mortality_

Author:

Robin Hillyard

Field Summary

static double

$InfantMortalityDefault 0.2

Fields inherited from class com.rubecula.darwin.domain.genetics.Mortality_

LOG

Fields inherited from interface net.sf.tostring0.IToString

ANGBR_OPEN, ANGBRA_CLSE, BRA_CLSE, BRA_OPEN, BRCE_OPEN, BRCS_CLSE, COLON, LIST_SEPARATOR, MAX_ELEMENTS_DEFAULT, S_MT, S_PERCENT, SEPARATOR, SPACE

Constructor Summary

Mortality_TS(org.apache.commons.math.random.RandomGenerator random, double infantMortality)

Method Summary

double

calculateMortality(int age, double fitness, double saturation) Method to calculate the mortality for an organism as 1 less the simple product of viabilityFactor, fitness and sustainabilityIndex.

Methods inherited from class com.rubecula.darwin.domain.genetics.Mortality_

calculateAgeViabilityFactor, calculateViability, equals, getBias, getRandom, hashCode, isMarked, setBias

Methods inherited from class net.sf.tostring0.AToString

toString, toString, toStringBrief, toStringId

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

$InfantMortalityDefault

public static final double $InfantMortalityDefault

0.2

See Also:

Constant Field Values

Constructor Detail

Mortality_TS

public Mortality_TS(org.apache.commons.math.random.RandomGenerator random,
                    double infantMortality)

Parameters:

random -

infantMortality - probability of infants dying immediately

Method Detail

calculateMortality

public double calculateMortality(int age,
                                 double fitness,
                                 double saturation)

Method to calculate the mortality for an organism as 1 less the simple product of viabilityFactor, fitness and sustainabilityIndex. The viability factor (VF) = (1-IM)^(age+1) where IM is the infant mortality (20%). The sustainabilityIndex (SI) = 1 if saturation less than 1; else SI = (1 - saturation)^2.

Specified by:

calculateMortality in interface Mortality

Overrides:

calculateMortality in class Mortality_

Parameters:

age - the age of the organism in generations.

fitness - the fitness of the organism for an environment.

saturation - a measure of the current population saturation (1 corresponds to the ideal population supportable by the environment.

Returns:

the probability of death before the next generation (between 0 and 1). TODO consider inlining this into isMarked (ie. pass in age, fitness, saturation, and return boolean)

See Also:

Mortality.calculateMortality(int,double,double)