Sugar Scapes

Implementations

• Mesa - Constant Growback
• Mesa Constant Growback Model with Traders

Growing Artificial Scocietes

• Growing Artificial Scocietes

Agent movement rule M:

• Look out as far as vision pemits in the four principal lattice directions and identify the unoccupied site(s) having the most sugar;
• If the greatest sugar value appears on multiple sites then select the nearest one;
• Move to this site
• Collect all the sugar at this new position.

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5ugarscape rule G_\infty:

• Grow back to full capacity immediately.

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Pollution formation rule P_{ \alpha \beta}:

• When sugar quantity s is gathered from the sugarscape, an amount of production pollution is generated in quantity \alpha s.
• When sugar amount m is consumed (metabolized), consumption pollution is generated according to \beta m.
• The total pollution on a site at time t, pt, is the sum of the pollution present at the previous time, plus the pollution resulting from production and consumption activities, that is, p_t = p_{t-1} + \alpha a_s + \beta m

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Agent movement rule M , modified for pollution :

• Look out as far as vision permits in the four principal lattice directions and identify the unoccupied site(s) having the maximum sugar to pollution ratio

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Agent sex rule S:

• Select a neighboring agent at random;
• If the neighbor is fenile and of the opposite sex and at least one of the agents has an empty neighboring site (for the baby), then a child is born;
• Repeat for all neighbors

Agent inheritance rule I:

• When an agent dies its wealth is equally divided among all its living children.

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Cultural transmission rule (tag flipping) K1:

• For each neighbor, a tag is randomly selected;
• If the neighbor agrees with the agent at that tag position, no change is made; if they disagree, the neighbor’s tag is flipped to agree with the agent’s tag.

Group membership rule (tag majority) K2:

• Agents are defined to be members of the Blue group when Os outnumber 1 s on their tag strings, and members of the Red group in the opposite case.

Vertical Transmission of Culture

When sex rule S is active, a child’s tag string is formed by comparing the parents’ tags at each position and applying the following rule: If the parents have the same tag (both have 0 or both have 1), the child is assigned that tag. If, however, one parent has tag 0 and the other has tag 1, then we toss a fair coin. If it comes up heads, the child’s tag is 1, if tails, it is O.

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Agent combat rule C_n:

• Look out as far as in the four principal lattice directions;
• Throw out all sites occupied by members of the agent’s own tribe;
• Throw out all sites occupied by members of different tribes who are wealthier than the agent;
• The reward of each remaining site is given by the resource level at the site plus, if it is occupied, the minimum of a and the occupant’s wealth;
• Throw out all sites that are vulnerable to retaliation;
• Select the nearest position having maximum reward and go there;
• Gather the resources at the site plus the minimum of a and the occupant’s wealth, if the site was occupied;
• If the site was occupied, then the former occupant is considered killed – permanently removed from play.