Model Builder's Guide Chapter 8 - Revision history

Fei: /* SELES Landscape Agents */

2006-10-03T15:08:07Z

SELES Landscape Agents

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	Table 7 SELES landscape agent properties. Each property controls a specific aspect of an agent’s behaviour.		Table 7 SELES landscape agent properties. Each property controls a specific aspect of an agent’s behaviour.

	[[Image:~~Table7~~.gif]]		[[Image:Property.gif]]

	==Landscape Agent Dynamic Variables and Contexts==		==Landscape Agent Dynamic Variables and Contexts==

Fei: /* NumOffspring */

2006-09-27T22:11:56Z

NumOffspring

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	Description: After movement, each agent has the option to create offspring, which are new agents in the same group, and at the same location as the parent. The new offspring are placed in the population pool until the next population update. After reproduction, the parent agent is assessed for survival (via Transitions). The consequent expressions are evaluated for each new offspring.		Description: After movement, each agent has the option to create offspring, which are new agents in the same group, and at the same location as the parent. The new offspring are placed in the population pool until the next population update. After reproduction, the parent agent is assessed for survival (via Transitions). The consequent expressions are evaluated for each new offspring.

	~~'''FIGURE MISSING'''~~		[[Image:Numoffspring.gif]]

	Go to... [[Model Builder's Guide Chapter 7 \| Prev Chapter]] [[Model Builder's Guide Chapter 9 \| Next Chapter]] [[Model Builder's Guide \| Guide Index]]		Go to... [[Model Builder's Guide Chapter 7 \| Prev Chapter]] [[Model Builder's Guide Chapter 9 \| Next Chapter]] [[Model Builder's Guide \| Guide Index]]

Fei: /* MoveProb */

2006-09-27T22:10:24Z

MoveProb

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	Description: After determining the move region, the preliminary expressions and main expression are evaluated for each cell in the move region. The consequent expressions are only evaluated in the single cell to which the agent actually moves. Note that if the move region is empty, or if no cell in the move region has a positive probability, then the agent has no cells to choose from, and so disappears from the system.		Description: After determining the move region, the preliminary expressions and main expression are evaluated for each cell in the move region. The consequent expressions are only evaluated in the single cell to which the agent actually moves. Note that if the move region is empty, or if no cell in the move region has a positive probability, then the agent has no cells to choose from, and so disappears from the system.

	~~'''FIGURE MISSING'''~~		[[Image:Moveprob.gif]]

	===NumOffspring===		===NumOffspring===

Fei: /* MoveLocation */

2006-09-27T22:08:33Z

MoveLocation

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	Description: The set of cells returned by this function defines the landscape as seen during the movement of an agent. The preliminary expressions are evaluated once before the main expression, while the consequent expressions are evaluated in each of the cells in the region.		Description: The set of cells returned by this function defines the landscape as seen during the movement of an agent. The preliminary expressions are evaluated once before the main expression, while the consequent expressions are evaluated in each of the cells in the region.

	~~'''FIGURE MISSING'''~~		[[Image:Movelocation.gif]]

	===MoveProb===		===MoveProb===

Fei: /* PopulationTime */

2006-09-27T22:07:00Z

PopulationTime

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	Description: After a population initiates, the preliminary expressions are evaluated. The main expression is then evaluated to determine the length of time between update steps. The next population update step is scheduled on the event queue to occur at pt(S) number of time units in the future. At the start of a population update step, the consequent expressions are evaluated and population is updated, starting with the movement step for each agent.		Description: After a population initiates, the preliminary expressions are evaluated. The main expression is then evaluated to determine the length of time between update steps. The next population update step is scheduled on the event queue to occur at pt(S) number of time units in the future. At the start of a population update step, the consequent expressions are evaluated and population is updated, starting with the movement step for each agent.

	~~'''FIGURE MISSING'''~~		[[Image:Poptime.gif]]

	===MoveLocation===		===MoveLocation===

Fei: /* Transitions */

2006-09-27T22:05:39Z

Transitions

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	Description: For each agent, ether after initiation or during the population update loop (after movement and reproduction), the preliminary expressions and the main expression, tr(S), are evaluated. If the result of tr(S) is TRUE (non-zero), then the agent survives. If the agent doesn’t survive, the agent is terminated. Otherwise the consequent expressions are evaluated, and the agent stays in the population pool until the next update step.		Description: For each agent, ether after initiation or during the population update loop (after movement and reproduction), the preliminary expressions and the main expression, tr(S), are evaluated. If the result of tr(S) is TRUE (non-zero), then the agent survives. If the agent doesn’t survive, the agent is terminated. Otherwise the consequent expressions are evaluated, and the agent stays in the population pool until the next update step.

	~~'''FIGURE MISSING'''~~		[[Image:Chapt8transitions.gif]]

	===PopulationTime===		===PopulationTime===

Fei: /* NumAgents */

2006-09-27T22:03:17Z

NumAgents

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	Description: Once ProbInit has produced the “probability surface” InitProb of potential sites, each agent selects a cell for initiation. By default this selection is independent (i.e. with replacement, where more than one agent may be placed in the same cell). Selection without replacement is possible by adding the keywords WITHOUT REPLACEMENT following the NumAgents property name. The cells in which each agent is initiated are selected stochastically from the potential sites based on the probabilities in InitProb (the probabilities are relative). After agents are placed, the consequent expressions for both NumAgents and ProbInit are evaluated.		Description: Once ProbInit has produced the “probability surface” InitProb of potential sites, each agent selects a cell for initiation. By default this selection is independent (i.e. with replacement, where more than one agent may be placed in the same cell). Selection without replacement is possible by adding the keywords WITHOUT REPLACEMENT following the NumAgents property name. The cells in which each agent is initiated are selected stochastically from the potential sites based on the probabilities in InitProb (the probabilities are relative). After agents are placed, the consequent expressions for both NumAgents and ProbInit are evaluated.

	~~'''FIGURE MISSING'''~~		[[Image:Numagents.gif]]

	===Transitions===		===Transitions===

Fei: /* InitialState */

2006-09-27T22:00:43Z

InitialState

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	Description: This property is useful to set up initial conditions local to an event, and to create multiple immigration instances of an event at startup. The preliminary expressions are evaluated once, while the consequent expressions are evaluated for each instance created. Note that since there is no instance prior to this property, population variables are not available in the preliminary context.		Description: This property is useful to set up initial conditions local to an event, and to create multiple immigration instances of an event at startup. The preliminary expressions are evaluated once, while the consequent expressions are evaluated for each instance created. Note that since there is no instance prior to this property, population variables are not available in the preliminary context.

	[[Image:~~8.2~~.gif]]		[[Image:Chp8initialstate.gif]]

	===ImmigrationTime===		===ImmigrationTime===

Fei: /* ProbInit */

2006-09-27T21:58:35Z

ProbInit

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	Informal Specification: After determining the initiation location, the preliminary expressions and the main expression are evaluated for each cell in the initiation region. The consequent expressions are only evaluated in those cells in which agents actually initiate – see NumAgents below.		Informal Specification: After determining the initiation location, the preliminary expressions and the main expression are evaluated for each cell in the initiation region. The consequent expressions are only evaluated in those cells in which agents actually initiate – see NumAgents below.

	[[Image:8.2.7.gif]]		[[Image:8.2.gif]]

	===NumAgents===		===NumAgents===

Fei: /* ProbInit */

2006-09-27T21:46:37Z

ProbInit

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	Informal Specification: After determining the initiation location, the preliminary expressions and the main expression are evaluated for each cell in the initiation region. The consequent expressions are only evaluated in those cells in which agents actually initiate – see NumAgents below.		Informal Specification: After determining the initiation location, the preliminary expressions and the main expression are evaluated for each cell in the initiation region. The consequent expressions are only evaluated in those cells in which agents actually initiate – see NumAgents below.

	~~'''FIGURE MISSING'''~~		[[Image:8.2.7.gif]]

	===NumAgents===		===NumAgents===