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The “show_mem” switch reveals the sum of the memory pheromones on each patch.
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This negative memory can become attractive thus pulling the agent away from roadblocks back toward previously known-good patches. However, if the agent ceases to move repeatedly, negative memory is deposited in the feasible patches near the agent. Usually, this memory is repulsive so that the agent explores new area. When an agent enters a patch, it can deposit an individual “memory” pheromone there that can decay over time. (uf) unfeasibility : The “unfeasible” space in any directionįactors are sensed inside cones pointing in each direction, and the size (angle and radius) of each cone can be specified as well. (f) feasibility : The “feasible” space (including riding on the backs of other ants) in any direction
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(m) memory : The memory (implemented as an individual pheromone) of cells in that direction (decay and removal parameters can be specified as well)
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(p) pheromone : The pheromone (deposited or persistent) in a particular direction (it is possible to adjust the evaporation and diffusion rate of the pheromone as well) (a) agent : The agents in a particular direction (s) space : The “available” space in any direction For example, if a stimulus is repulsive everywhere, an influence of “-1” can be used so that each of the gains can be positive. Influence is a shared gain applied to each gain of that stimulus type equally. A negative gain indicates increased stimulus leads to lower chance of choice in that direction. A positive gain indicates increased stimulus leads to a higher chance of choice in that direction. Gain in any particular directly roughly represents a “sensing ability” or a “tendency” how increased stimulus linearly affects whether the agent will decide on that direction. MOVEMENT FACTORS: GAIN, INFLUENCE, AND CONESĮach movement factor “gain” and “influence” variable starts with one or two letters indicating the type of factor. Increasing the bias for any particular direction causes less stimulus to be required for an individual ant to choose that direction.Īmplified stimulus and bias terms are arguments to a logistic function (1/(1+e^(-z))), and so care should be taken when choosing magnitudes of bias and gain terms. The (space) bias terms represent the background tendency for any particular direction of movement. This is an agent-based model that uses logistic switching to balance several different factors that could influence movement in any particular direction.
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