Creates a list of control settings for the aco.operator function.
Usage
acoControl(
nants = 15,
niter = 20,
Q = 1,
rho = 0.5,
phi0 = 2,
phi_min = 1,
phi_max = Inf,
alpha = 1,
elite = 0,
prob_min = 0.2,
diff_tol = 1
)Arguments
- nants
Integer. Number of ants (candidate solutions) generated at each iteration. Defaults to 15.
- niter
Integer. Maximum number of ACO iterations. Defaults to 20.
- Q
A positive numeric value. Pheromone scaling constant controlling the amount of pheromone deposited by high-quality solutions during each iteration. Defaults to 1.
- rho
Numeric in (0, 1). Pheromone evaporation rate. Higher values increase evaporation, encouraging exploration. Defaults to 0.5.
- phi0
A non-negative numeric value. Initial pheromone value assigned to all nodes at the start of the search. Defaults to 2.
- phi_min
A non-negative numeric value. Lower bound for pheromone values, preventing premature convergence. Defaults to 1.
- phi_max
A non-negative numeric value. Upper bound for pheromone values, limiting excessive reinforcement. Defaults to Inf.
- alpha
A non-negative numeric value. Exponent controlling the influence of pheromone values on the probability of selecting a component during solution construction. Defaults to 1.
- elite
Numeric. Elitism rate between 0 and 1. Specifies the proportion of elite ants whose solutions are preserved and directly propagated to the next iteration. Defaults to 0.
- prob_min
Numeric. Minimum probability floor between 0 and 1. Applied during solution construction to avoid zero-probability choices. Defaults to 0.2.
- diff_tol
Numeric. Significance difference threshold used for ranking. Values within this threshold are considered equal and receive the same rank. Default is 1.