Evolution-Sim

Simulating Natural selection through a population of predators and prey

Note - The frequency distribution between the mean and the variation is given by a Gaussian distribution

Meaning of Setup Parameters

Note: Where a float is given, it means any decimal numer, decimal means any number between 0 and 1

Sim

• length - int - The number of 'turns' the sim has
• breedTurns - int - After how many turns the animals breed

Value Change

• doChange - boolean Whether or not to change a value after n turns
• changeTurns - int - After how many turns does the value change
• keyCategory - string - The category of the key of the value to be changed (food, prey, etc)
• key - string - The specific key of the value to be changed
• changeAmount - any - Number added to the value every change turn

Board

• boardSizeX - int - The width of the board the animals inhabit
• boardSizeY - int - The height of the board
• fullThreshold - decimal - The percentage of the board that needs to have be occupied before the sim auto ends

Food

• foodCount - int - The number of food sources that spawn
• meanEnergy - decimal - The mean amount of energy provided by a food sources
• energyVariation - decimal - The variation of amount of energy provided
• spawnThreshold - decimal The number multiplied by the total population to get when the food sources need replenishing

Prey

Both health and energy are values between 0 and 1, with 1 being full and 0 being empty (duh)

• preyCount - int - The number of prey that spawn at the start
• initEnergy - decimal - The amount of energy prey will spawn with
• meanSpeed - float - The mean of the speed value a prey will have
• speedVariation - float How much the speed value will be varied
• dayCost - float - How strongly prey is penalized at the start of each day
• meanSensingRange - float - The mean range an animal can sense (see)
• sensingRangeVariation - float - The variation of the sensing range
• breedThreshold - decimal - The mininimum amount of energy for a prey to breed at the end of a turn

Predators

• predatorCount - int - The number of predators that spawn at the start
• initEnergy - decimal - The amount of energy prey will spawn with
• meanSpeed - float - The mean of the speed value a predator will have at the start
• speedVariation - float - How much the speed value will be varied
• dayCost - float - How strongly prey is penalized at the start of each day
• meanSensingRange - float - The mean range an animal can sense (see)
• sensingRangeVariation - float - The variation of the sensing range
• breedThreshold - decimal - The mininimum amount of energy for a prey to breed at the end of a turn

Formula for traits

Prey

• Efficiency = log(speed + 1) / 20
• Energy Cost from movement = distance * (3 - Efficiency)

Outputted .csv file format

Column Letter	Column A	Column B	Column C	Column D	Column E
Description	Turn Number	Total Prey Population	Average Speed	Average Sensing Range	Number of new prey born THAT turn